asiliantfb: add missing return statement

Commit 032220ba

 (asiliantfb: fix cmap memory leaks) changed the function
init_asiliant from void to int, resulting in the following compile warning:

  drivers/video/asiliantfb.c: In function `init_asiliant':
  drivers/video/asiliantfb.c:536: warning: control reaches end of non-void function

Fix the warning by returning 0.

Signed-off-by: Vlada Peric <vlada.peric@gmail.com>
Cc: Andres Salomon <dilinger@debian.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>