staging: dgap: Fix BUG in processing config file

This patch fixes an OOPS caused by a pointer being
changed between the malloc and free.

Signed-off-by: Mark Hounschell <markh@compro.net>
Tested-by: Mark Hounschell <markh@compro.net>
Reported-by: Mark Hounschell <markh@compro.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>