lightnvm: pblk: fix double-free on pblk init

Prevent pblk->lines being double freed in case of an error during pblk
initialization.

Fixes: dd2a4343: "lightnvm: pblk: sched. metadata on write thread"
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NJavier González <javier@cnexlabs.com>
Signed-off-by: NMatias Bjørling <matias@cnexlabs.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>

drivers/lightnvm/pblk-init.c

@@ -812,8 +812,6 @@ static int pblk_lines_init(struct pblk *pblk)
 fail_free_lines:
 	while (--i >= 0)
 		pblk_free_line_bitmaps(&pblk->lines[i]);
-
-	kfree(pblk->lines);
 fail_free_bb_aux:
 	kfree(l_mg->bb_aux);
 fail_free_bb_template: