Staging: sxg: fix build warnings in sxg.c

This compiles out some functions that are not being used to keep the
build clean so that we can see the "real" warnings and errors.

Cc: Mithlesh Thukral <mithlesh@linsyssoft.com>
Cc: LinSysSoft Sahara Team <saharaproj@linsyssoft.com>
Cc: Christopher Harrer <charrer@alacritech.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>