gtk_builder_add_from_file error handling

[Gabriele Greco <gabriele greco darts it>]

I just found that with a builder file with a syntax error my app crashed
with:

*** glibc detected *** ./packager: double free or corruption (out):
0x09aa33d0 ***

I think I'm using gtkbuilder error handling in the right way and
documentation does not suggest my how to use it:

GError *err = NULL;
if (!gtk_builder_add_from_file(builder_, "myfile.xml", &erro)) {

}

-- 
Ing. Gabriele Greco, DARTS Engineering
Tel: +39-0105761240  Fax: +39-0105760224
s-mail: Via G.T. Invrea 14 - 16129 GENOVA (ITALY)