Some mbuf related fixes in icmp_error()
* check mbuf length before doing mtod() and accessing to IP header;
* update oip pointer and all depending pointers after m_pullup();
* remove extra checks and extra parentheses, wrap long lines;
PR: 222670
Reported by: Prabhakar Lakhera
MFC after: 1 week
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head/sys/netinet/ip_icmp.c