staging: gdm72xx: Add space around '/'

Add space around operator '/'. Problem found using
checkpatch.pl
CHECK: spaces preferred around that '/' (ctx:VxV)

Signed-off-by: Burcin Akalin <brcnakalin@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>