[PATCH] radeonfb: clean up EDID sysfs attribute

radeonfb does not clean up EDID sysfs attribute

Signed-off-by: Jon Smirl <jonsmirl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>