Fix bug

[ 1232517 ] OverflowError in time.utime() causes strange traceback

A needed error check was missing.

(Actually, this error check may only have become necessary in fairly
recent Python, not sure).

Backport candidate.
diff --git a/Misc/NEWS b/Misc/NEWS
index bcc696a..b3a56b0 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 Core and builtins
 -----------------
 
+- SF bug #1232517: An overflow error was not detected properly when
+  attempting to convert a large float to an int in os.utime().
+
 - SF bug #1224347: hex longs now print with lowercase letters just
   like their int counterparts.