[XFRM]: Fix endless loop in xfrm_policy_insert

The patch 'Fix policy update bug when increasing
priority of last policy' broke this, when a policy
with lower priority than an existing policy is inserted
xfrm_policy_insert loops forever.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/xfrm/xfrm_policy.c

@@ -353,6 +353,7 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
 			newpos = p;
 		if (delpol)
 			break;
+		p = &pol->next;
 	}
 	if (newpos)
 		p = newpos;