[PATCH] greybus: audio: Fix sparse warning.

[Rajat Asthana <thisisrast7@gmail.com>]

Enforce int type on SNDRV_CTL_ELEM_IFACE_MIXER to fix sparse warning:
> warning: restricted snd_ctl_elem_iface_t degrades to integer

The iface field in the gb_audio_control struct is of type __u8, but the
values stored in it are of type int. So on conversion they are degraded.
Adding (__force int) will enforce them not to be degraded.

Signed-off-by: Rajat Asthana <thisisrast7@gmail.com>
---
 drivers/staging/greybus/audio_topology.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
index 1fc7727ab7be..1e613d42d823 100644
--- a/drivers/staging/greybus/audio_topology.c
+++ b/drivers/staging/greybus/audio_topology.c
@@ -676,7 +676,7 @@ static int gbaudio_tplg_create_kcontrol(struct gbaudio_module_info *gb,
 	struct gbaudio_ctl_pvt *ctldata;
 
 	switch (ctl->iface) {
-	case SNDRV_CTL_ELEM_IFACE_MIXER:
+	case (__force int)SNDRV_CTL_ELEM_IFACE_MIXER:
 		switch (ctl->info.type) {
 		case GB_AUDIO_CTL_ELEM_TYPE_ENUMERATED:
 			ret = gbaudio_tplg_create_enum_kctl(gb, kctl, ctl);
@@ -903,7 +903,7 @@ static int gbaudio_tplg_create_wcontrol(struct gbaudio_module_info *gb,
 	int ret;
 
 	switch (ctl->iface) {
-	case SNDRV_CTL_ELEM_IFACE_MIXER:
+	case (__force int)SNDRV_CTL_ELEM_IFACE_MIXER:
 		switch (ctl->info.type) {
 		case GB_AUDIO_CTL_ELEM_TYPE_ENUMERATED:
 			ret = gbaudio_tplg_create_enum_ctl(gb, kctl, ctl);
-- 
2.31.1