Silence a warning on the Emscripten build.

examples/build/README.md

@@ -9,7 +9,7 @@ On Windows, you need to move into the build and run emsdk_env.bat from a command
 path like "C:\emsdk\emsdk_env.bat". Note that PowerShell doesn't work for me for some reason. Examples:
 
     emcc ../simple_playback_sine.c -o bin/simple_playback_sine.html
-    emcc ../simple_playback_sine.c -o bin/simple_playback_sine.html -s WASM=0 -Wall
+    emcc ../simple_playback_sine.c -o bin/simple_playback_sine.html -s WASM=0 -Wall -Wextra
     
 If you output WASM it may not work when running the web page locally. To test you can run with something
 like this:

miniaudio.h

@@ -28680,6 +28680,7 @@ static ma_result ma_context_get_device_info__webaudio(ma_context* pContext, ma_d
     MA_ZERO_MEMORY(pDeviceInfo->id.webaudio, sizeof(pDeviceInfo->id.webaudio));
 
     /* Only supporting default devices for now. */
+    (void)pDeviceID;
     if (deviceType == ma_device_type_playback) {
         ma_strncpy_s(pDeviceInfo->name, sizeof(pDeviceInfo->name), MA_DEFAULT_PLAYBACK_DEVICE_NAME, (size_t)-1);
     } else {