Fix exit code for non-existent file.

The patched command line utilities have been aligned to tshark
behavior.

Change-Id: I0cb764b37792e882e182681124341893b3958c59
Reviewed-on: https://code.wireshark.org/review/19580
Reviewed-by: Michael Mann <mmann78@netscape.net>
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

capinfos.c

@@ -1720,7 +1720,7 @@ main(int argc, char *argv[])
         fprintf(stderr, "(%s)\n", err_info);
         g_free(err_info);
       }
-      overall_error_status = 1; /* remember that an error has occurred */
+      overall_error_status = 2; /* remember that an error has occurred */
       if (!continue_after_wtap_open_offline_failure)
         goto exit;
     }

captype.c

@@ -210,7 +210,7 @@ main(int argc, char *argv[])
           fprintf(stderr, "(%s)\n", err_info);
           g_free(err_info);
         }
-        overall_error_status = 1; /* remember that an error has occurred */
+        overall_error_status = 2; /* remember that an error has occurred */
       }
     }
 

reordercap.c

@@ -295,7 +295,7 @@ main(int argc, char *argv[])
             fprintf(stderr, "(%s)\n", err_info);
             g_free(err_info);
         }
-        exit(1);
+        exit(2);
     }
     DEBUG_PRINT("file_type_subtype is %d\n", wtap_file_type_subtype(wth));