Style: Format code with clang-format 6.0.1

(cherry picked from commit 7c9f7452f4)

Travis: Update style checks to clang-format 6.0.1

(cherry picked from commit 003ac67df1)

platform/android/audio_driver_opensl.cpp

@@ -42,7 +42,8 @@ void AudioDriverOpenSL::_buffer_callback(
 		/*   SLuint32 eventFlags,
     const void * pBuffer,
     SLuint32 bufferSize,
-    SLuint32 dataUsed*/) {
+    SLuint32 dataUsed*/
+) {
 
 	bool mix = true;