[omx] Avoid hang following jpegs that failed to decode

There's a few instanced of xbmc hanging following a jpeg that failed to decode on GPU:
http://forum.stmlabs.com/showthread.php?tid=14839
raspberrypi/firmware#288
http://openelec.tv/forum/120-news-announcements/70709-openelec-4-0-released?start=15#105219

It should fail and continue with software decode. It hangs on the OMX_FreeBuffer call.
Looks like image_decode component should be returned to idle state before freeing buffers

xbmc/cores/omxplayer/OMXImage.cpp

@@ -918,6 +918,7 @@ void COMXImageDec::Close()
 
   if(m_omx_decoder.IsInitialized())
   {
+    m_omx_decoder.SetStateForComponent(OMX_StateIdle);
     m_omx_decoder.FlushInput();
     m_omx_decoder.FreeInputBuffers();
   }
@@ -1433,6 +1434,7 @@ void COMXImageReEnc::Close()
 
   if(m_omx_decoder.IsInitialized())
   {
+    m_omx_decoder.SetStateForComponent(OMX_StateIdle);
     m_omx_decoder.FlushInput();
     m_omx_decoder.FreeInputBuffers();
   }
@@ -1888,6 +1890,7 @@ void COMXTexture::Close()
 
   if(m_omx_decoder.IsInitialized())
   {
+    m_omx_decoder.SetStateForComponent(OMX_StateIdle);
     m_omx_decoder.FlushInput();
     m_omx_decoder.FreeInputBuffers();
   }