Fix bug 6192 ("mapped before underway" warning when clicking on
	any sidebar tab).

	* src/nautilus-view-frame.c: (nautilus_view_frame_map): Remove
	inappropriate check of state, and replace it with a simple NULL
	check that handles the failed case.

	* libnautilus-extensions/nautilus-directory-background.c:
	(nautilus_file_background_is_set): Fixed backwards logic by
	removing an erroneous "!".

	* libnautilus-extensions/nautilus-icon-factory.c: Formatting
	tweaks.
	* src/file-manager/fm-directory-view.c: Formatting tweak.
	* src/nautilus-application.c: (nautilus_application_startup):
	Fixed comment.
	(check_for_and_run_as_super_user): Formatting tweak.