A fix for gcc -Wconversion warning in glibmm

[Alexander Shaduri <ashaduri gmail com>]

Hello all,

I'm not sure if I should open a bug report for such a simple patch,
so I'm going to post it here instead (please advise on how to handle
this in the future).

Basically, this fixes the annoying gcc warning in glibmm when
-Wconversion is used:
/usr/include/glibmm-2.4/glibmm/timeval.h: In member function ‘double Glib::TimeVal::as_double() const’:
/usr/include/glibmm-2.4/glibmm/timeval.h:160:62: warning: conversion to ‘double’ from ‘long int’ may alter its value

Tested with gcc 4.5.0.
I'm attaching a patch (against glibmm master) which fixes the
warning by making an explicit cast where an implicit one was
being made.

Thanks,
Alexander

diff --git a/glib/glibmm/timeval.h b/glib/glibmm/timeval.h
index 685f783..03202a1 100644
--- a/glib/glibmm/timeval.h
+++ b/glib/glibmm/timeval.h
@@ -157,7 +157,7 @@ TimeVal& TimeVal::operator-=(long seconds)
 inline
 double TimeVal::as_double() const
 {
-  return tv_sec + ((double) tv_usec / (double) G_USEC_PER_SEC);
+  return (double)tv_sec + ((double) tv_usec / (double) G_USEC_PER_SEC);
 }
 
 inline