SPU2-X: Minor bugfix to suspend/shutdown code which caused SPU2-X to hang in very rare occasions.

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@1999 96395faa-99c1-11dd-bbfe-3dabce05a288

plugins/spu2-x/src/Windows/SndOut_XAudio2.cpp

@@ -209,7 +209,11 @@ private:
 			EnterCriticalSection( &cs );
 
 			// All of these checks are necessary because XAudio2 is wonky shizat.
-			if( pSourceVoice == NULL || context == NULL ) return;
+			if( pSourceVoice == NULL || context == NULL )
+			{
+				LeaveCriticalSection( &cs );
+				return;
+			}
 
 			T* qb = (T*)context;