netlabel: Deletion of an unnecessary check before the function call "cipso_v4_doi_putdef"

The cipso_v4_doi_putdef() function tests whether its argument is NULL and then
returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/netlabel/netlabel_mgmt.c

@@ -242,7 +242,6 @@ static int netlbl_mgmt_add_common(struct genl_info *info,
 	return 0;
 
 add_failure:
-	if (cipsov4)
 	cipso_v4_doi_putdef(cipsov4);
 	if (entry)
 		kfree(entry->domain);