dm: add missing unlock on in dm_keyslot_evict()

We need to call dm_put_live_table() even if dm_get_live_table() returns
NULL.

Fixes: 9355a9e ("dm: support key eviction from keyslot managers of underlying devices")
Cc: stable@vger.kernel.org	# v5.12+
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

drivers/md/dm-table.c

@@ -1173,7 +1173,7 @@ static int dm_keyslot_evict(struct blk_crypto_profile *profile,
 
 	t = dm_get_live_table(md, &srcu_idx);
 	if (!t)
-		return 0;
+		goto put_live_table;
 
 	for (unsigned int i = 0; i < t->num_targets; i++) {
 		struct dm_target *ti = dm_table_get_target(t, i);
@@ -1184,6 +1184,7 @@ static int dm_keyslot_evict(struct blk_crypto_profile *profile,
 					  (void *)key);
 	}
 
+put_live_table:
 	dm_put_live_table(md, srcu_idx);
 	return 0;
 }