[ICMP]: Restore pskb_pull calls in receive function

Somewhere along the development of my ICMP relookup patch the header
length check went AWOL on the non-IPsec path. This patch restores the
check.

Signed-off-by: Herbert Xu <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/ipv4/icmp.c

···
 			goto error;
 	}
 
-	__skb_pull(skb, sizeof(*icmph));
+	if (!pskb_pull(skb, sizeof(*icmph)))
+		goto error;
 
 	icmph = icmp_hdr(skb);
 

net/ipv6/icmp.c

···
 		}
 	}
 
-	__skb_pull(skb, sizeof(*hdr));
+	if (!pskb_pull(skb, sizeof(*hdr)))
+		goto discard_it;
 
 	hdr = icmp6_hdr(skb);