audio: Remove device bit only on active_input

This makes the code less confusing.

Change-Id: I6020f892f5165a6c784b05737e29b24d7121b8c9
diff --git a/audio/audio_hw.c b/audio/audio_hw.c
index 7783ae6..3659277 100644
--- a/audio/audio_hw.c
+++ b/audio/audio_hw.c
@@ -617,9 +617,9 @@
     source = (active_input == NULL) ?
                                 AUDIO_SOURCE_DEFAULT : active_input->source;
 
-    in_device = ((active_input == NULL) ?
-                                    AUDIO_DEVICE_NONE : active_input->devices)
-                                & ~AUDIO_DEVICE_BIT_IN;
+    in_device = (active_input == NULL) ?
+                    AUDIO_DEVICE_NONE :
+                    (active_input->devices & ~AUDIO_DEVICE_BIT_IN);
     channel_mask = (active_input == NULL) ?
                                 AUDIO_CHANNEL_IN_MONO : active_input->main_channels;