Core Audio: Fix a -Wshadow warning.

miniaudio.h

@@ -32797,9 +32797,9 @@ static ma_result ma_find_best_format__coreaudio(ma_context* pContext, AudioObjec
 
     hasSupportedFormat = MA_FALSE;
     for (iFormat = 0; iFormat < deviceFormatDescriptionCount; ++iFormat) {
-        ma_format format;
-        ma_result formatResult = ma_format_from_AudioStreamBasicDescription(&pDeviceFormatDescriptions[iFormat].mFormat, &format);
-        if (formatResult == MA_SUCCESS && format != ma_format_unknown) {
+        ma_format formatFromDescription;
+        ma_result formatResult = ma_format_from_AudioStreamBasicDescription(&pDeviceFormatDescriptions[iFormat].mFormat, &formatFromDescription);
+        if (formatResult == MA_SUCCESS && formatFromDescription != ma_format_unknown) {
             hasSupportedFormat = MA_TRUE;
             bestDeviceFormatSoFar = pDeviceFormatDescriptions[iFormat].mFormat;
             break;