gfile: Initialize variable to pacify static analysis

Not a real bug, but will quiet the analysis.

https://bugzilla.gnome.org/show_bug.cgi?id=733576
gfileutils: Add missing g_free() in error path

Discovered by static analysis.

https://bugzilla.gnome.org/show_bug.cgi?id=733576
gthreadedresolver: Unref unexpected address

I don't believe any real app would hit this, but we do leak
if it occurs.

Spotted by static analysis.

https://bugzilla.gnome.org/show_bug.cgi?id=733576
gsettingsschema: Close directory

Spotted by static analysis.

https://bugzilla.gnome.org/show_bug.cgi?id=733576
gapplicationimpl-dbus: Fix leak of fd list object

Spotted by static analysis.

https://bugzilla.gnome.org/show_bug.cgi?id=733576
gsettingsschema: Suppress return value check

We're intentionally ignoring the value here.  Pacifies static
analysis.

https://bugzilla.gnome.org/show_bug.cgi?id=733576
glocalfileinfo: Suppress static analysis return value warning

Just ignore the return value, since we're checking contents != NULL.

https://bugzilla.gnome.org/show_bug.cgi?id=733576
gkeyfilesettingsbackend: Add assertion for known-true condition

We know the group exists since we enumerated it.  Should silence a
static analysis warning.

https://bugzilla.gnome.org/show_bug.cgi?id=733576
gcredentials: Add assertion to pacify static analysis

This should always be true.

https://bugzilla.gnome.org/show_bug.cgi?id=733576