[PATCH] raid1: fix oops in bio_put()

From: Neil Brown <neilb@cse.unsw.edu.au>

Fix an off-by-one in the r1buf_pool_alloc() ENOMEM error recovery path.

drivers/md/raid1.c

@@ -104,8 +104,8 @@ static void * r1buf_pool_alloc(int gfp_flags, void *data)
 	for ( ; i > 0 ; i--)
 		__free_page(bio->bi_io_vec[i-1].bv_page);
 out_free_bio:
-	while ( j < conf->raid_disks )
-		bio_put(r1_bio->bios[++j]);
+	while ( ++j < conf->raid_disks )
+		bio_put(r1_bio->bios[j]);
 	r1bio_pool_free(r1_bio, conf->mddev);
 	return NULL;
 }