airo: reduce stack memory footprint

Applying kernel janitors todos (reduce stack
footprint where possible) to airo wireless driver.
(Before 1124 bytes on i386, now 876)

Signed-off-by: Frank Seidel <frank@f-seidel.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
1 file changed