YAMAMOTO Takashi bf9ba474a5 net/icmp/icmp_recvfrom.c: fix a NULL dereference
Found by clang-check:

icmp/icmp_recvfrom.c:374:30: warning: Dereference of null pointer (loaded from variable 'fromlen')
      if (fromlen == NULL && *fromlen < sizeof(struct sockaddr_in))
                             ^~~~~~~~
1 warning generated.
2020-07-30 16:16:21 +02:00
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