Added protection for GetCapabilities() failure.

webrtc/modules/audio_device/win/audio_mixer_manager_win.cc

Index: webrtc/modules/audio_device/win/audio_mixer_manager_win.cc
diff --git a/webrtc/modules/audio_device/win/audio_mixer_manager_win.cc b/webrtc/modules/audio_device/win/audio_mixer_manager_win.cc
index 4d6e7bb9a694206ecb9e5b77bf044e42ed33b39e..79076d39a70f2e49f0c8817b49531a03cfcbe15d 100644
--- a/webrtc/modules/audio_device/win/audio_mixer_manager_win.cc
+++ b/webrtc/modules/audio_device/win/audio_mixer_manager_win.cc
@@ -195,7 +195,9 @@ int32_t AudioMixerManager::EnumerateSpeakers()
     for (mixId = 0; mixId < nDevices; mixId++)
     {
         // get capabilities for the specified mixer ID
-        GetCapabilities(mixId, caps);
+        if (!GetCapabilities(mixId, caps))
+            continue;
+
         WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "[mixerID=%d] %s: ", mixId, WideToUTF8(caps.szPname));
         // scan all avaliable destinations for this mixer
         for (destId = 0; destId < caps.cDestinations; destId++)
@@ -280,7 +282,9 @@ int32_t AudioMixerManager::EnumerateMicrophones()
     for (mixId = 0; mixId < nDevices; mixId++)
     {
         // get capabilities for the specified mixer ID
-        GetCapabilities(mixId, caps);
+        if (!GetCapabilities(mixId, caps))
+            continue;
+
         WEBRTC_TRACE(kTraceInfo, kTraceAudioDevice, _id, "[mixerID=%d] %s: ", mixId, WideToUTF8(caps.szPname));
         // scan all avaliable destinations for this mixer
         for (destId = 0; destId < caps.cDestinations; destId++)