GC Adapter: do not proceed with the input read if the thread isn’t running

If the Init() call does not work in the fallback path, then abort.

Source/Core/Core/HW/SI_GCAdapter.cpp

@@ -249,9 +249,15 @@ void Input(int chan, GCPadStatus* pad)
 	if (s_handle == nullptr)
 	{
 		if (s_detected)
+		{
 			Init();
+			if (s_handle == nullptr)
+				return;
+		}
 		else
+		{
 			return;
+		}
 	}
 
 	u8 controller_payload_copy[37];