WaE: 'bFrac' may be used uninitialized in this function

Actually it isn't (I think), but let's silence the compiler.

Thanks to mjw for noticing and pointing out this warning on IRC.

Change-Id: I78885a6dac0c3e27867215d99f6e01d429d086ca

unotools/source/misc/datetime.cxx

@@ -392,7 +392,7 @@ bool ISO8601parseTime(const OUString &aTimeStr, starutil::Time& rTime)
     sal_Int32 n = 0;
     OUString tokInt;
     OUString tokFrac;
-    bool bFrac;
+    bool bFrac = false;
     // hours
     if (bSuccess && (bSuccess = getISO8601TimeToken(aTimeStr, n, tokInt, bFrac, tokFrac)))
     {