[PATCH] dm.c: free cloned bio on error path

From: Kevin Corry <kevcorry@us.ibm.com>

In __map_bio(), if the target returns an error while mapping the I/O, the
cloned bio needs to be freed.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/md/dm.c

@@ -369,6 +369,7 @@ static void __map_bio(struct dm_target *ti, struct bio *clone,
 		struct dm_io *io = tio->io;
 		free_tio(tio->io->md, tio);
 		dec_pending(io, -EIO);
+		bio_put(clone);
 	}
 }