windowscodecs: Fix IWICBitmapEncoder::SetPalette for a not initialized case in JPEG encoder.

[Vincent Povirk]

From: Dmitry Timoshkov <dmitry at baikal.ru>

Signed-off-by: Vincent Povirk <vincent at codeweavers.com>
---
 dlls/windowscodecs/jpegformat.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/dlls/windowscodecs/jpegformat.c b/dlls/windowscodecs/jpegformat.c
index 69d1187..ef050ba 100644
--- a/dlls/windowscodecs/jpegformat.c
+++ b/dlls/windowscodecs/jpegformat.c
@@ -1409,8 +1409,18 @@ static HRESULT WINAPI JpegEncoder_SetColorContexts(IWICBitmapEncoder *iface,
 
 static HRESULT WINAPI JpegEncoder_SetPalette(IWICBitmapEncoder *iface, IWICPalette *pIPalette)
 {
+    JpegEncoder *This = impl_from_IWICBitmapEncoder(iface);
+    HRESULT hr;
+
     TRACE("(%p,%p)\n", iface, pIPalette);
-    return WINCODEC_ERR_UNSUPPORTEDOPERATION;
+
+    EnterCriticalSection(&This->lock);
+
+    hr = This->initialized ? WINCODEC_ERR_UNSUPPORTEDOPERATION : WINCODEC_ERR_NOTINITIALIZED;
+
+    LeaveCriticalSection(&This->lock);
+
+    return hr;
 }
 
 static HRESULT WINAPI JpegEncoder_SetThumbnail(IWICBitmapEncoder *iface, IWICBitmapSource *pIThumbnail)
-- 
2.7.4