Remove some unnecessary null-checks.
Remove some unnecessary null-checks.

Thanks to Florian Steinel for pointing it out.

svn path=/trunk/; revision=295

GNOME/rygel,Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,luisbg/rygel,GNOME/rygel,Tarnyko/rygel