rt2x00: checkpatch.pl error fixes for rt2800lib.c

rt2800lib.c:831: ERROR: inline keyword should sit between storage class and type

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>