staging: dgap: fix smatch warn: unsigned var is never less than zero
This patch fixes a smatch warning about an unsigned integer being tested for less than zero. Signed-off-by: Mark Hounschell <markh@compro.net> Tested-by: Mark Hounschell <markh@compro.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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