Neat: do not compute `audioAttributes` if not necessary.

features/call/impl/src/main/kotlin/io/element/android/features/call/impl/ui/ElementCallActivity.kt

@@ -230,10 +230,10 @@ class ElementCallActivity :
 
     @Suppress("DEPRECATION")
     private fun requestAudioFocus() {
-        val audioAttributes = AudioAttributes.Builder()
-            .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
-            .build()
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val audioAttributes = AudioAttributes.Builder()
+                .setUsage(AudioAttributes.USAGE_VOICE_COMMUNICATION)
+                .build()
             val request = AudioFocusRequest.Builder(AudioManager.AUDIOFOCUS_GAIN)
                 .setAudioAttributes(audioAttributes)
                 .build()
@@ -246,7 +246,6 @@ class ElementCallActivity :
                 AudioManager.STREAM_VOICE_CALL,
                 AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE,
             )
-
             audioFocusChangeListener = listener
         }
     }