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unix: don't crash if gmtime returns nil

--- a/unix/otfsys.c

+++ b/unix/otfsys.c

@@ -33,7 +33,9 @@

 	static char buf[32];

 	time_t t = v;

 	struct tm *tm;

-	tm = gmtime(&t);

-	strftime(buf, sizeof(buf), "%c", tm);

+

+	buf[0] = 0;

+	if((tm = gmtime(&t)) != nil)

+		strftime(buf, sizeof(buf), "%c", tm);

 	return buf;

 }