Mark functions not returning as sudo_noreturn

We also put NOTREACHED where it applies.

plugins/sudoers/cvtsudoers.c

@@ -195,7 +195,7 @@ main(int argc, char *argv[])
 	    break;
 	case 'h':
 	    help();
-	    break;
+	    /* NOTREACHED */
 	case 'i':
 	    free(conf->input_format);
 	    conf->input_format = strdup(optarg);
@@ -258,6 +258,7 @@ main(int argc, char *argv[])
 	    break;
 	default:
 	    usage();
+	    /* NOTREACHED */
 	}
     }
     argc -= optind;

plugins/sudoers/regress/check_symbols/check_symbols.c

@@ -31,7 +31,7 @@
 
 sudo_dso_public int main(int argc, char *argv[]);
 
-static void
+sudo_noreturn static void
 usage(void)
 {
     fprintf(stderr, "usage: %s plugin.so symbols_file\n", getprogname());

plugins/sudoers/regress/iolog_plugin/check_iolog_plugin.c

@@ -44,7 +44,7 @@ struct sudo_plugin_event * (*plugin_event_alloc)(void);
 
 sudo_dso_public int main(int argc, char *argv[], char *envp[]);
 
-static void
+sudo_noreturn static void
 usage(void)
 {
     fprintf(stderr, "usage: %s pathname\n", getprogname());

plugins/sudoers/regress/parser/check_addr.c

@@ -65,7 +65,7 @@ check_addr(char *input)
     return 0;
 }
 
-static void
+sudo_noreturn static void
 usage(void)
 {
     fprintf(stderr, "usage: %s datafile\n", getprogname());

plugins/sudoers/testsudoers.c

@@ -201,7 +201,7 @@ main(int argc, char *argv[])
 		break;
 	    default:
 		usage();
-		break;
+	    /* NOTREACHED */
 	}
     }
     argc -= optind;
@@ -731,7 +731,7 @@ testsudoers_error(const char *buf)
     return fputs(buf, stderr);
 }
 
-static void
+sudo_noreturn static void
 usage(void)
 {
     (void) fprintf(stderr, "usage: %s [-dt] [-G sudoers_gid] [-g group] [-h host] [-i input_format] [-P grfile] [-p pwfile] [-U sudoers_uid] [-u user] <user> <command> [args]\n", getprogname());

plugins/sudoers/visudo.c

@@ -197,7 +197,7 @@ main(int argc, char *argv[])
 		break;
 	    case 'h':
 		help();
-		break;
+	    /* NOTREACHED */
 	    case 'I':
 		edit_includes = false;
 		break;