pcm: rate - fix the crash in snd_pcm_rate_may_wait_for_avail_min()

pcm: rate - fix the crash in snd_pcm_rate_may_wait_for_avail_min()

The pcm argument passed to the conversion function in
snd_pcm_plugin_may_wait_for_avail_min_conv() should be
pcm->fast_op_arg.

Test command: arecord -Dplughw:x -r12000 -c2 -fS16_LE -M temp.wav

Fixes: d9dbb57b ("pcm: rate - rewrite the may_wait_for_avail_min callback for the rate plugin")
BugLink: https://lore.kernel.org/alsa-devel/1667793912-18957-1-git-send-email-shengjiu.wang@nxp.com/
Fixes: https://github.com/alsa-project/alsa-lib/issues/282
Reported-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>