Previously, the following steps failed with error:
1) Open /dev/dsp with O_RDONLY
2) Open /dev/dsp with O_WRONLY
3) Issue SNDCTL_DSP_GETOSPACE ioctl() for 2)
This is because IS_WRITE() returns false for 2) due to incorrect
openflags handling in archetype instance. This patch fixes the
issue by adding open_setup() to fhandler_dev_dsp to set openflags
correctly for each instance.
Fixes: 92ddb7429065 ("* fhandler_dsp.cc (fhandler_dev_dsp::open): Remove archetype handling.")
Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
eaa606c0b7