Null pointer call from WiFiClient::localIP() to IPAddress by mhightower83 · Pull Request #7221 · esp8266/Arduino

@mhightower83

Fixes exception 28 in IPAddress(const ipv4_addr* fw_addr); with null ip_addr
pointer passed in by WiFiCient.cpp localIP(). I assumed that localIP()
was called shortly after _pcb became null.

d-a-v

approved these changes Apr 17, 2020