[PATCH] frv: make get_user macro cast pointers

Make the get_user macro cast the source pointer to an appropriate type for the
specified size.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>