Only unlock GPU channel state on queue wait if it was previously locked

app/src/main/cpp/skyline/soc/gm20b/gpfifo.cpp

@@ -359,9 +359,11 @@ namespace skyline::soc::gm20b {
             }, [this, &channelLocked]() {
                 // If we run out of GpEntries to process ensure we submit any remaining GPU work before waiting for more to arrive
                 Logger::Debug("Finished processing pushbuffer batch");
+                if (channelLocked) {
                     channelCtx.executor.Submit();
                     channelCtx.Unlock();
                     channelLocked = false;
+                }|
             });
         } catch (const signal::SignalException &e) {
             if (e.signal != SIGINT) {