rem: exit_status = 1;
add: exit_status = EXIT_FAILURE;
context: next_file (FILE *fp){  static char *prev_file;  char *file;  if (fp)    {      if (ferror (fp))	{	  error (0, errno, "%s", prev_file);	  exit_status = 1;	}      if (fp == stdin)	clearerr (fp);		/* Also clear EOF. */      else if (fclose (fp) == EOF)	{	  error (0, errno, "%s", prev_file);	  exit_status = 1;	}    }  while ((file = *file_list++) != NULL)    {      if (file[0] == '-' && file[1] == '\0')	{	  have_read_stdin = 1;	  prev_file = file;	  return stdin;	}      fp = fopen (file, "r");      if (fp)	{	  prev_file = file;	  return fp;	}      error (0, errno, "%s", file);      exit_status = 1;    }  return NULL;}