[PATCH] s3c2410fb: Minor warning fix

The function s3c2410fb_activate_var does not return
a value, therefore it should be declared void.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>