[PATCH] oss compile fix (missing spinlock)

sound/oss/v_midi.h

@@ -11,5 +11,6 @@ typedef struct vmidi_devc {
 	   int input_opened;
 	   int intr_active;
 	   void (*midi_input_intr) (int dev, unsigned char data);
+	   spinlock_t lock;
 	} vmidi_devc;