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Check that m->m_pkthdr.rcvif is not NULL before checking if a packet
was received on a broadcast address on the input path. Under certain circumstances this could result in a panic, notably for locally-generated packets which do not have m_pkthdr.rcvif set. This is a similar situation to that which is solved by src/sys/netinet/ip_icmp.c rev 1.66. PR: kern/52935
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