[RFC PATCH 17/23] ALSA: xen: remove 'set but not used' warning

[Pierre-Louis Bossart]

Fix W=1 warning. Mark the 'req' variable as __always_unused.

sound/xen/xen_snd_front.c: In function ‘xen_snd_front_stream_close’:
sound/xen/xen_snd_front.c:117:21: warning: variable ‘req’ set but not
used [-Wunused-but-set-variable]
  117 |  struct xensnd_req *req;
      |                     ^~~

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/xen/xen_snd_front.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/xen/xen_snd_front.c b/sound/xen/xen_snd_front.c
index a9e5c2cd7698..e21d0bfafeae 100644
--- a/sound/xen/xen_snd_front.c
+++ b/sound/xen/xen_snd_front.c
@@ -114,7 +114,7 @@ int xen_snd_front_stream_prepare(struct xen_snd_front_evtchnl *evtchnl,
 
 int xen_snd_front_stream_close(struct xen_snd_front_evtchnl *evtchnl)
 {
-	struct xensnd_req *req;
+	__always_unused struct xensnd_req *req;
 	int ret;
 
 	mutex_lock(&evtchnl->u.req.req_io_lock);
-- 
2.25.1