control.c: snd_ctl_wait: fix revents handling
control.c: snd_ctl_wait: fix revents handling

The revents parameter of snd_ctl_poll_descriptors_revents() is a single
value, not an array.

Signed-off-by: Clemens Ladisch <9f57ef5ff1095f40b1ee8b7caa363908baef59d7@ladisch.de>

lgirdwood/alsa-lib,Distrotech/alsa-lib,alsa-project/alsa-lib,takaswie/alsa-lib,alsa-project/alsa-lib,gittup/alsa-lib,tiwai/alsa-lib,mikelima/alsa-lib,takaswie/alsa-lib,alsa-project/alsa-lib,takaswie/alsa-lib,lgirdwood/alsa-lib,mikelima/alsa-lib,mengdonglin/alsa-lib,Distrotech/alsa-lib,Distrotech/alsa-lib,gittup/alsa-lib,mengdonglin/alsa-lib,gittup/alsa-lib,mikelima/alsa-lib,mengdonglin/alsa-lib,takaswie/alsa-lib,Distrotech/alsa-lib,mikelima/alsa-lib,gittup/alsa-lib,mengdonglin/alsa-lib,tiwai/alsa-lib,zedongchen/alsa-lib,zedongchen/alsa-lib,mengdonglin/alsa-lib,mikelima/alsa-lib,tiwai/alsa-lib,Distrotech/alsa-lib,lgirdwood/alsa-lib,zedongchen/alsa-lib,alsa-project/alsa-lib,tiwai/alsa-lib,lgirdwood/alsa-lib,zedongchen/alsa-lib,lgirdwood/alsa-lib,takaswie/alsa-lib,zedongchen/alsa-lib