xfrm: a few coding style clean ups

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/xfrm/xfrm_policy.c

@@ -4414,7 +4414,8 @@ int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
 	struct xfrm_migrate *mp;
 
 	/* Stage 0 - sanity checks */
-	if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
+	err = xfrm_migrate_check(m, num_migrate);
+	if (err < 0)
 		goto out;
 
 	if (dir >= XFRM_POLICY_MAX) {
@@ -4423,7 +4424,8 @@ int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
 	}
 
 	/* Stage 1 - find policy */
-	if ((pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id)) == NULL) {
+	pol = xfrm_migrate_policy_find(sel, dir, type, net, if_id);
+	if (!pol) {
 		err = -ENOENT;
 		goto out;
 	}
@@ -4445,7 +4447,8 @@ int xfrm_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
 	}
 
 	/* Stage 3 - update policy */
-	if ((err = xfrm_policy_migrate(pol, m, num_migrate)) < 0)
+	err = xfrm_policy_migrate(pol, m, num_migrate);
+	if (err < 0)
 		goto restore_state;
 
 	/* Stage 4 - delete old state(s) */

net/xfrm/xfrm_user.c

@@ -1538,7 +1538,7 @@ static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
 				  &p->info.saddr, 1,
 				  family);
 	err = -ENOENT;
-	if (x == NULL)
+	if (!x)
 		goto out_noput;
 
 	err = xfrm_alloc_spi(x, p->min, p->max);
@@ -2718,7 +2718,7 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
 	struct xfrm_encap_tmpl  *encap = NULL;
 	u32 if_id = 0;
 
-	if (attrs[XFRMA_MIGRATE] == NULL)
+	if (!attrs[XFRMA_MIGRATE])
 		return -EINVAL;
 
 	kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
@@ -2727,7 +2727,7 @@ static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
 	if (err)
 		return err;
 
-	err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
+	err = copy_from_user_migrate(m, kmp, attrs, &n);
 	if (err)
 		return err;