The current code in rivafb will not accept modes other than 640x480-60 if
the the EDID block is absent.

This patch changes the behavior to the opposite, if without an EDID, rivafb
will accept all modelines coming from userspace (2.4 behavior).
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>