[PATCH] ipw2200: Suppress warning message

The following message will be only printed if DEBUG_NOTIF is on.  "Unknown
notification: subtype=40,flags=0xa0,size=40"

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Cc: James Ketrenos <jketreno@linux.intel.com>
Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: "John W. Linville" <linville@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>