init SocketAddress::port_ in default-ctor

Summary: The port is not accessed in such a state, but nevertheless zero it.

Differential Revision: D28155314

fbshipit-source-id: 0ee6a617be5de66d1e068c242d52423adb31f486

folly/SocketAddress.h

@@ -595,7 +595,7 @@ class SocketAddress {
     AddrStorage() : addr() {}
   } storage_{};
   // IPAddress class does nto save zone or port, and must be saved here
-  uint16_t port_;
+  uint16_t port_{0};
 
   bool external_{false};
 };