pyglib: Fix a compiler warning
pyglib: Fix a compiler warning

thiblahute/pygobject,Distrotech/pygobject,alexef/pygobject,nzjrs/pygobject,thiblahute/pygobject,davidmalcolm/pygobject,davibe/pygobject,Distrotech/pygobject,pexip/pygobject,choeger/pygobject-cmake,davidmalcolm/pygobject,alexef/pygobject,choeger/pygobject-cmake,GNOME/pygobject,alexef/pygobject,davibe/pygobject,Distrotech/pygobject,nzjrs/pygobject,davibe/pygobject,sfeltman/pygobject,davibe/pygobject,jdahlin/pygobject,choeger/pygobject-cmake,Distrotech/pygobject,GNOME/pygobject,thiblahute/pygobject,sfeltman/pygobject,MathieuDuponchelle/pygobject,MathieuDuponchelle/pygobject,GNOME/pygobject,davidmalcolm/pygobject,sfeltman/pygobject,MathieuDuponchelle/pygobject,jdahlin/pygobject,jdahlin/pygobject,pexip/pygobject,pexip/pygobject,nzjrs/pygobject