Bug 508576 - Simplify GTK initialization

Function gtk_init_with_args is present in the min GTK version required
so there is no need to check for it's existence and try gtk_init_check
after that.
Also g_error_free is mandatory function so no need for if(g_error_free)
g_error_free(...).

Change-Id: Idd13fb1009e0b0e434e0a409487863dd3ea06325
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
3 files changed