bsg: free the request before return error code

Free the request rq before returning error code.

Fixes: 972248e9 ("scsi: bsg-lib: handle bidi requests without block layer help")
Signed-off-by: NPan Bian <bianpan2016@163.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

block/bsg.c

@@ -157,8 +157,10 @@ static int bsg_sg_io(struct request_queue *q, fmode_t mode, void __user *uarg)
 		return PTR_ERR(rq);
 
 	ret = q->bsg_dev.ops->fill_hdr(rq, &hdr, mode);
-	if (ret)
+	if (ret) {
+		blk_put_request(rq);
 		return ret;
+	}
 
 	rq->timeout = msecs_to_jiffies(hdr.timeout);
 	if (!rq->timeout)