Bug 432617: added a missing _MD_UNLOCK() in IsFileLocal.  The patch is contributed by Martin Furter <mf@rola.ch>.  r=wtc.
Bug 432617: added a missing _MD_UNLOCK() in IsFileLocal.  The patch is
contributed by Martin Furter <mf@rola.ch>.  r=wtc.

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub