dm9601: Consolidate common parts of dm_write_*_async

dm_write_async and dm_write_reg_async are almost identical.
Move common functionality to dm_write_async_helper (saves ~256b).

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
1 file changed