lightnvm: pblk: fix use-after-free bug

Remove one of the calls to function bio_put(), so *bio* is only
freed once.

Notice that bio is being dereferenced in bio_put(), hence leading to
a use-after-free bug once *bio* has already been freed.

Addresses-Coverity-ID: 1475952 ("Use after free")
Fixes: 55d8ec3539 ("lightnvm: pblk: support packed metadata")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-recovery.c

@@ -418,7 +418,6 @@ retry_rq:
 	if (ret) {
 		pblk_err(pblk, "I/O submission failed: %d\n", ret);
 		bio_put(bio);
-		bio_put(bio);
 		return ret;
 	}