Use #if for USE_UDEV.

lib/libdevmapper.c

@@ -61,7 +61,7 @@ static int _dm_udev_wait(uint32_t cookie) { return 0; };
 
 static int _dm_use_udev(void)
 {
-#ifdef USE_UDEV /* cannot be enabled if devmapper is too old */
+#if USE_UDEV /* cannot be enabled if devmapper is too old */
 	return dm_udev_get_sync_support();
 #else
 	return 0;

src/utils_tools.c

@@ -425,7 +425,7 @@ void tools_package_version(const char *name, bool use_pwlibs)
 	bool udev = false, blkid = false, keyring = false, fips = false,
 	     kernel_capi = false, pwquality = false, passwdqc = false,
 	     hw_opal = false;
-#ifdef USE_UDEV
+#if USE_UDEV
 	udev = true;
 #endif
 #ifdef HAVE_BLKID