mshtml/tests: Remove an always true conditional subexpression (PVS-Studio).

dlls/mshtml/tests/events.c

@@ -1412,7 +1412,7 @@ static void pump_msgs(BOOL *b)
             DispatchMessageW(&msg);
         }
     }else {
-        while(!b && PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE)) {
+        while(PeekMessageW(&msg, NULL, 0, 0, PM_REMOVE)) {
             TranslateMessage(&msg);
             DispatchMessageW(&msg);
         }