staging: dgap: re-factor some code for 80+ lines as reported by checkpatch

This patch re-factors some code to fix some 80+ lines as reported by checkpatch.
This patch was suggested and authored by Dan Carpenter. A test case for this
patch has been written and used to show the patch to be correct.

Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mark Hounschell <markh@compro.net>
Tested-by: Mark Hounschell <markh@compro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>