hfsplus: add missing call to bio_put()

hfsplus leaks bio objects by failing to call bio_put() on the bios
it allocates. Add the missing call to fix the leak.
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Cc: <stable@kernel.org> # .38.x, .39.x
Signed-off-by: Christoph Hellwig <hch@lst.de>

fs/hfsplus/wrapper.c

@@ -36,6 +36,7 @@ int hfsplus_submit_bio(struct block_device *bdev, sector_t sector,
 {
 	DECLARE_COMPLETION_ONSTACK(wait);
 	struct bio *bio;
+	int ret = 0;
 
 	bio = bio_alloc(GFP_NOIO, 1);
 	bio->bi_sector = sector;
@@ -54,8 +55,10 @@ int hfsplus_submit_bio(struct block_device *bdev, sector_t sector,
 	wait_for_completion(&wait);
 
 	if (!bio_flagged(bio, BIO_UPTODATE))
-		return -EIO;
-	return 0;
+		ret = -EIO;
+
+	bio_put(bio);
+	return ret;
 }
 
 static int hfsplus_read_mdb(void *bufptr, struct hfsplus_wd *wd)