playlist/pls: don't free stack buffer

NEWS

 ver 0.18.7 (not yet released)
 * playlist
+  - pls: fix crash after parser error
   - soundcloud: fix build failure with libyajl 2.0.1
 * daemon: don't initialize supplementary groups when already running
   as the configured user

src/playlist/PlsPlaylistPlugin.cxx

@@ -68,7 +68,6 @@ pls_parser(GKeyFile *keyfile, std::forward_list<SongPointer> &songs)
 			FormatError(pls_domain, "Invalid PLS entry %s: '%s'",
 				    key, error->message);
 			g_error_free(error);
-			g_free(key);
 			return;
 		}