ALSA: pcm: Fix unlocked runtime state reads in xfer ioctls

ALSA: pcm: Fix unlocked runtime state reads in xfer ioctls

The recent runtime state locking cleanup converted several PCM ioctl state
checks to snd_pcm_get_state(), including snd_pcm_pre_prepare(),
snd_pcm_drain() and snd_pcm_kernel_ioctl(). The native and compat xfer
ioctl paths still sample runtime->state directly before dispatching to the
PCM transfer helpers, and snd_pcm_common_ioctl() still samples the
DISCONNECTED state directly in its common precheck.

Use snd_pcm_get_state() for those ioctl-side prechecks as well. This keeps
the externally visible ioctl entry checks consistent with the stream-locked
state access used by the recent PCM state-read cleanup.

Fixes: 032322b44c02 ("ALSA: pcm: oss: use proper stream lock for runtime->state access")
Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com>
Link: https://patch.msgid.link/20260605-alsa-pcm-xfer-state-helper-v1-1-eba97cecf820@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>