Input: iforce - use ENOSPC instead of ENOMEM

Use -ENOSPC instead of -ENOMEM when the iforce device doesn't have
enough free memory for the new effect.  All other drivers are using
-ENOSPC, so this makes the behaviour coherent.

Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>