Merge pull request #236 from liskin/memleaks

fix a few memory leaks reported by valgrind

src/backend/driver.c

@@ -26,6 +26,7 @@ enum driver detect_driver(xcb_connection_t *c, backend_t *backend_data, xcb_wind
 		    c, xcb_randr_get_providers(c, window), NULL);
 		if (r == NULL) {
 			log_warn("Failed to get RANDR providers");
+			free(randr_version);
 			return 0;
 		}
 
@@ -58,9 +59,11 @@ enum driver detect_driver(xcb_connection_t *c, backend_t *backend_data, xcb_wind
 				ret |= DRIVER_INTEL;
 			}
 			free(name);
+			free(r2);
 		}
 		free(r);
 	}
+	free(randr_version);
 
 	// If the backend supports driver detection, use that as well
 	if (backend_data && backend_data->ops->detect_driver) {

src/compton.c

@@ -1333,9 +1333,12 @@ static void handle_pending_updates(EV_P_ struct session *ps) {
 		// Call fill_win on new windows
 		handle_new_windows(ps);
 
-		auto r = xcb_get_input_focus_reply(ps->c, xcb_get_input_focus(ps->c), NULL);
-		if (!ps->active_win || (r && r->focus != ps->active_win->base.id)) {
-			recheck_focus(ps);
+		{
+			auto r = xcb_get_input_focus_reply(ps->c, xcb_get_input_focus(ps->c), NULL);
+			if (!ps->active_win || (r && r->focus != ps->active_win->base.id)) {
+				recheck_focus(ps);
+			}
+			free(r);
 		}
 
 		// Process window updates

src/win.c

@@ -1232,6 +1232,7 @@ struct win *fill_win(session_t *ps, struct win *w) {
 	if (a->_class == XCB_WINDOW_CLASS_INPUT_ONLY) {
 		// No need to manage this window, but we still keep it on the window stack
 		w->managed = false;
+		free(a);
 		return w;
 	}