[media] vb2: simplify a confusing condition

q->start_streaming_called is always true, so the WARN_ON check against
it being false can be dropped.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/v4l2-core/videobuf2-core.c

@@ -1159,9 +1159,8 @@ void vb2_buffer_done(struct vb2_buffer *vb, enum vb2_buffer_state state)
 	if (!q->start_streaming_called) {
 		if (WARN_ON(state != VB2_BUF_STATE_QUEUED))
 			state = VB2_BUF_STATE_QUEUED;
-	} else if (!WARN_ON(!q->start_streaming_called)) {
-		if (WARN_ON(state != VB2_BUF_STATE_DONE &&
-			    state != VB2_BUF_STATE_ERROR))
+	} else if (WARN_ON(state != VB2_BUF_STATE_DONE &&
+			   state != VB2_BUF_STATE_ERROR)) {
 			state = VB2_BUF_STATE_ERROR;
 	}