staging: dgap: remove unused variable 'orig_count'

This patch fixes sparse warning
warning: variable ‘orig_count’ set but not used [-Wunused-but-set-variable]

Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>