udevadm: show only version number for '--version' option

This effectively reverts 2bc54be485
and relevant changes in #9920, as it is used to determine the version
of udev, e.g., dracut.

Fixes dracutdevs/dracut#468.

src/udev/udevadm-control.c

@@ -144,7 +144,7 @@ int control_main(int argc, char *argv[], void *userdata) {
                         break;
                 }
                 case 'V':
-                        return version();
+                        return print_version();
                 case 'h':
                         return help();
                 case '?':

src/udev/udevadm-hwdb.c

@@ -65,7 +65,7 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_root = optarg;
                         break;
                 case 'V':
-                        return version();
+                        return print_version();
                 case 'h':
                         return help();
                 case '?':

src/udev/udevadm-info.c

@@ -357,7 +357,7 @@ int info_main(int argc, char *argv[], void *userdata) {
                         export_prefix = optarg;
                         break;
                 case 'V':
-                        return version();
+                        return print_version();
                 case 'h':
                         return help();
                 case '?':

src/udev/udevadm-monitor.c

@@ -205,7 +205,7 @@ static int parse_argv(int argc, char *argv[]) {
                         break;
                 }
                 case 'V':
-                        return version();
+                        return print_version();
                 case 'h':
                         return help();
                 case '?':

src/udev/udevadm-settle.c

@@ -57,7 +57,7 @@ static int parse_argv(int argc, char *argv[]) {
                         arg_exists = optarg;
                         break;
                 case 'V':
-                        return version();
+                        return print_version();
                 case 'h':
                         return help();
                 case 's':

src/udev/udevadm-test-builtin.c

@@ -40,7 +40,7 @@ static int parse_argv(int argc, char *argv[]) {
         while ((c = getopt_long(argc, argv, "Vh", options, NULL)) >= 0)
                 switch (c) {
                 case 'V':
-                        return version();
+                        return print_version();
                 case 'h':
                         return help();
                 case '?':

src/udev/udevadm-test.c

@@ -62,7 +62,7 @@ static int parse_argv(int argc, char *argv[]) {
                         }
                         break;
                 case 'V':
-                        return version();
+                        return print_version();
                 case 'h':
                         return help();
                 case '?':

src/udev/udevadm-trigger.c

@@ -232,7 +232,7 @@ int trigger_main(int argc, char *argv[], void *userdata) {
                 }
 
                 case 'V':
-                        return version();
+                        return print_version();
                 case 'h':
                         return help();
                 case '?':

src/udev/udevadm.c

@@ -68,7 +68,7 @@ static int parse_argv(int argc, char *argv[]) {
                         return help();
 
                 case 'V':
-                        return version();
+                        return print_version();
 
                 case '?':
                         return -EINVAL;
@@ -81,7 +81,7 @@ static int parse_argv(int argc, char *argv[]) {
 }
 
 static int version_main(int argc, char *argv[], void *userdata) {
-        return version();
+        return print_version();
 }
 
 static int help_main(int argc, char *argv[], void *userdata) {

src/udev/udevadm.h

@@ -1,6 +1,8 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 #pragma once
 
+#include <stdio.h>
+
 int info_main(int argc, char *argv[], void *userdata);
 int trigger_main(int argc, char *argv[], void *userdata);
 int settle_main(int argc, char *argv[], void *userdata);
@@ -9,3 +11,8 @@ int monitor_main(int argc, char *argv[], void *userdata);
 int hwdb_main(int argc, char *argv[], void *userdata);
 int test_main(int argc, char *argv[], void *userdata);
 int builtin_main(int argc, char *argv[], void *userdata);
+
+static inline int print_version(void) {
+        puts(PACKAGE_VERSION);
+        return 0;
+}