2006-05-04  Michael Natterer  <mitch@gimp.org>

	* app/plug-in/gimppluginshm.c: cleaned up a bit.

	(gimp_plug_in_shm_new): return NULL if anything goes wrong,
	instead of a GimpPlugInShm structure that contains no shm (we
	don't need multiple cases of "there is no shm"),

	* app/plug-in/gimppluginmanager.[ch]
	(gimp_plug_in_manager_get_shm_ID)
	(gimp_plug_in_manager_get_shm_addr): removed these functions.

	* app/plug-in/gimppluginmanager-call.c (gimp_plug_in_manager_call_run)
	* app/plug-in/gimpplugin-message.c (gimp_plug_in_handle_tile_req):
	get the shm ID and addr directly from manager->shm if it exists,
	use -1 and NULL otherwise.

	Unrelated:

	* app/plug-in/gimppluginmanager.c: move most stuff from
	gimp_plug_in_manager_exit() to gimp_plug_in_manager_finalize().
	Simplify plug-in killing in _exit().