net.c: Silence clang warning.

net.c: Silence clang warning.

clang-3.8.0 on FreeBSD complains about a recent change to net.c:

	net.c:606:33: warning: missing field 'ss_family' initializer [-Wmissing-field-initializers]
		struct sockaddr_storage ss = {0};
					       ^
This line was introduced in commit 63128eea (net: Always initialize
struct sockaddr_storage) to avoid a warning from the static analyzer
of clang. Setting .ss_family initializes all struct members, which
makes both the analyzer and the compiler happy again.