Bug 941296 - Add a missing close brace. r=cpearce

Accidentally clobbered this when adding the APPLEMEDIA #ifdef.
Fixes build against ffmpeg, etc.

content/media/fmp4/PlatformDecoderModule.cpp

@@ -121,6 +121,7 @@ PlatformDecoderModule::Create()
 #ifdef MOZ_FFMPEG
   if (sFFmpegDecoderEnabled) {
     return FFmpegRuntimeLinker::CreateDecoderModule();
+  }
 #endif
 #ifdef MOZ_APPLEMEDIA
   nsAutoPtr<AppleDecoderModule> m(new AppleDecoderModule());