config: Remove temporary file if replacement failed

(cherry picked from commit 75dda08f)

src/config/file.c

@@ -680,7 +680,8 @@ static int SaveConfigFile( vlc_object_t *p_this, const char *psz_module_name,
 #ifndef WIN32
     fdatasync (fd); /* Flush from OS */
     /* Atomically replace the file... */
-    utf8_rename (temporary, permanent);
+    if (utf8_rename (temporary, permanent))
+        utf8_unlink (temporary);
     /* (...then synchronize the directory, err, TODO...) */
     /* ...and finally close the file */
     vlc_mutex_unlock (&lock);
@@ -689,7 +690,8 @@ static int SaveConfigFile( vlc_object_t *p_this, const char *psz_module_name,
 #ifdef WIN32
     /* Windows cannot remove open files nor overwrite existing ones */
     utf8_unlink (permanent);
-    utf8_rename (temporary, permanent);
+    if (utf8_rename (temporary, permanent))
+        utf8_unlink (temporary);
     vlc_mutex_unlock (&lock);
 #endif