hal: fix for voip volume setting when select_devices()

voip volume setting will not be applied correctly when select_devices()
since its usecase type won't necessary be voip_usecase
check for voip_usecase existance and not a capture type instead.

Bug: 110446256
Test: self tested 20 times making a DUO video call

Change-Id: If3e6bc46be02a83ccf92bd56fc48a9c88c1e21bd
Signed-off-by: Yung Ti Su <andysu@google.com>
diff --git a/hal/audio_hw.c b/hal/audio_hw.c
index fb15db5..2caad10 100644
--- a/hal/audio_hw.c
+++ b/hal/audio_hw.c
@@ -1482,7 +1482,7 @@
             voice_set_sidetone(adev, out_snd_device, true);
     }
 
-    if (usecase == voip_usecase) {
+    if (usecase->type != PCM_CAPTURE && voip_usecase) {
         struct stream_out *voip_out = voip_usecase->stream.out;
         audio_extn_utils_send_app_type_gain(adev,
                                             voip_out->app_type_cfg.app_type,