lightnvm: pblk: fix bad error check

Fix bad error check

Fixes: a4bd217b "lightnvm: physical block device (pblk) target"
Signed-off-by: NJavier González <javier@cnexlabs.com>
Reviewed-by: NMatias Bjørling <matias@cnexlabs.com>
Signed-off-by: NJens Axboe <axboe@fb.com>

drivers/lightnvm/pblk-core.c

@@ -1273,7 +1273,7 @@ struct pblk_line *pblk_line_replace_data(struct pblk *pblk)
 retry_setup:
 	if (!pblk_line_set_metadata(pblk, new, cur)) {
 		new = pblk_line_retry(pblk, new);
-		if (new)
+		if (!new)
 			return NULL;
 
 		goto retry_setup;