MFH: r432969

multimedia/vdr-plugin-vdrmanager: unbreak with clang 4.0

sock.cpp:23:13: error: ordered comparison between pointer and zero ('int (*)(int, int, int)' and 'int')

if (socket >= 0) {
    ~~~~~~ ^  ~

PR: 216217
Reported by: antoine (via exp-run)
Obtained from: upstream
Approved by: ports-secteam blanket