Reset flushing state if DQBUF return EPIPE

This is to handle the case there was no more buffer to dequeue,
otherwise flushing state will stick and we will not be able to to queue
buffer afterward.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>

libv4l-rockchip_v2/libv4l-encplugin-rockchip.c

@@ -432,8 +432,15 @@ static int ioctl_dqbuf_locked(struct encoder_context *ctx, int fd,
 	}
 
 	ret = SYS_IOCTL(fd, VIDIOC_DQBUF, buffer);
-	if (ret)
+	if (ret) {
+		/* In some cases we may not have a buffer with the V4L2_BUF_FLAG_LAST set,
+		 * make sure to reset our flushing state */
+		if (errno == EPIPE) {
+			ctx->flushing = false;
+			ctx->can_qbuf = true;
+		}
 		return ret;
+	}
 
 	ret = SYS_IOCTL(fd, VIDIOC_QUERYBUF, buffer);
 	if (ret)