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webcookies: use strtol() to parse HH:MM:SS

atoi() currently interprets leading zeros as octal (BUG!),
so use strtol with explicit base 10 avoiding the issue.

--- a/sys/src/cmd/webcookies.c

+++ b/sys/src/cmd/webcookies.c

@@ -722,9 +722,9 @@

 		return -1;

 	}

-	tm.hour = atoi(s);

-	tm.min = atoi(s+3);

-	tm.sec = atoi(s+6);

+	tm.hour = strtol(s, 0, 10);

+	tm.min = strtol(s+3, 0, 10);

+	tm.sec = strtol(s+6, 0 10);

 	if(tm.hour >= 24 || tm.min >= 60 || tm.sec >= 60){

 		if(debug)

 			fprint(2, "invalid time (%s)\n", os);