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fixed incorrect include comments

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plugins.d/password-prompt.c
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 * along with this program.  If not, see
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 * <http://www.gnu.org/licenses/>.
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 * 
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 * Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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 * <https://www.fukt.bsnet.se/~teddy/>.
 
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 * Contact the authors at <mandos@fukt.bsnet.se>.
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 */
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#define _GNU_SOURCE             /* getline() */
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#include <errno.h>              /* errno, EINVAL */
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#include <iso646.h>             /* or, not */
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#include <stdbool.h>            /* bool, false, true */
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#include <string.h>             /* strlen, rindex, strncmp, strcmp */
 
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#include <string.h>             /* strlen, rindex */
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#include <argp.h>               /* struct argp_option, struct
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                                   argp_state, struct argp,
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                                   argp_parse(), error_t,
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  }
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  sigemptyset(&new_action.sa_mask);
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  sigaddset(&new_action.sa_mask, SIGINT);
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  sigaddset(&new_action.sa_mask, SIGHUP);
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  sigaddset(&new_action.sa_mask, SIGTERM);
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  ret = sigaction(SIGINT, NULL, &old_action);
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  if(ret == -1){
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    perror("sigaction");
 
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  ret = sigaddset(&new_action.sa_mask, SIGINT);
 
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  if(ret == -1){
 
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    perror("sigaddset");
 
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    return EXIT_FAILURE;
 
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  }
 
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  ret = sigaddset(&new_action.sa_mask, SIGHUP);
 
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  if(ret == -1){
 
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    perror("sigaddset");
 
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    return EXIT_FAILURE;
 
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  }
 
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  ret = sigaddset(&new_action.sa_mask, SIGTERM);
 
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  if(ret == -1){
 
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    perror("sigaddset");
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    return EXIT_FAILURE;
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  }
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  /* Need to check if the handler is SIG_IGN before handling:
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     | [[info:libc:Initial Signal Actions]] |
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     | [[info:libc:Basic Signal Handling]]  |
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  */
 
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  ret = sigaction(SIGINT, NULL, &old_action);
 
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  if(ret == -1){
 
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    perror("sigaction");
 
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    return EXIT_FAILURE;
 
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  }
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  if(old_action.sa_handler != SIG_IGN){
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    ret = sigaction(SIGINT, &new_action, NULL);
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    if(ret == -1){