Staging: sxg: fix build warnings in downloadB firmware files

These variables are never used, so #ifdef them away.

This should probably be fixed up properly from someone who knows why we
are even including these files in the first place, when they do not seem
to be needed at all.

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>