ALSA: usb-audio: qcom: Fix incorrect type in enable_audio_stream

ALSA: usb-audio: qcom: Fix incorrect type in enable_audio_stream

Fix sparse warning:
sound/usb/qcom/qc_audio_offload.c:943:27: sparse: incorrect type in argument 2
expected unsigned int val but got snd_pcm_format_t.

Explicitly cast pcm_format to unsigned int for snd_mask_leave().

Fixes: 326bbc348298 ("ALSA: usb-audio: qcom: Introduce QC USB SND offloading support")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202604062109.Oxi8JjWW-lkp@intel.com/
Signed-off-by: songxiebing <songxiebing@kylinos.cn>
Link: https://patch.msgid.link/20260408083311.774173-1-songxiebing@kylinos.cn
Signed-off-by: Takashi Iwai <tiwai@suse.de>