esp4: improve xfrm4_beet_gso_segment() to be more readable

This patch is to improve the code to make xfrm4_beet_gso_segment()
more readable, and keep consistent with xfrm6_beet_gso_segment().
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

net/ipv4/esp4_offload.c

@@ -141,20 +141,23 @@ static struct sk_buff *xfrm4_beet_gso_segment(struct xfrm_state *x,
 
 	skb->transport_header += x->props.header_len;
 
-	if (proto == IPPROTO_BEETPH) {
-		struct ip_beet_phdr *ph = (struct ip_beet_phdr *)skb->data;
-
-		skb->transport_header += ph->hdrlen * 8;
-		proto = ph->nexthdr;
-	} else if (x->sel.family == AF_INET6) {
+	if (x->sel.family != AF_INET6) {
+		if (proto == IPPROTO_BEETPH) {
+			struct ip_beet_phdr *ph =
+				(struct ip_beet_phdr *)skb->data;
+
+			skb->transport_header += ph->hdrlen * 8;
+			proto = ph->nexthdr;
+		} else {
+			skb->transport_header -= IPV4_BEET_PHMAXLEN;
+		}
+	} else {
 		__be16 frag;
 
 		skb->transport_header +=
 			ipv6_skip_exthdr(skb, 0, &proto, &frag);
 		if (proto == IPPROTO_TCP)
 			skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4;
-	} else {
-		skb->transport_header -= IPV4_BEET_PHMAXLEN;
 	}
 
 	__skb_pull(skb, skb_transport_offset(skb));