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cifs: fix timezone for timestamps

tm2sec() ignores tm.tzoff and will use the local timezone for
conversion. to make it work right, we convert the dos timestamp
as GMT and then correct timezone with the offset provided by the
server.

--- a/sys/src/cmd/cifs/pack.c

+++ b/sys/src/cmd/cifs/pack.c

@@ -401,17 +401,17 @@

 		d = gl16(p);

 	}

+	memset(&tm, 0, sizeof(tm));

 	tm.year = 80 + (d >> 9);

 	tm.mon = ((d >> 5) & 017) - 1;

 	tm.mday = d & 037;

-	tm.zone[0] = 0;

-	tm.tzoff = p->s->tz;

 	tm.hour = t >> 11;

 	tm.min = (t >> 5) & 63;

 	tm.sec = (t & 31) << 1;

+	strcpy(tm.zone, "GMT");

-	return tm2sec(&tm);

+	return tm2sec(&tm) + p->s->tz;

 }

 long

-- 

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