windowscodecs/tests: Use proper helpers for iface calls.

dlls/windowscodecs/tests/metadata.c

@@ -939,7 +939,7 @@ static void test_metadata_png(void)
 
     IWICBitmapDecoder_Release(decoder);
 
-    IWICStream_Release(stream);
+    IStream_Release(stream);
 }
 
 START_TEST(metadata)

dlls/windowscodecs/tests/stream.c

@@ -379,7 +379,7 @@ static void test_StreamOnMemory(void)
 
 
     IWICStream_Release(pStream);
-    IWICStream_Release(pFactory);
+    IWICImagingFactory_Release(pFactory);
     CoUninitialize();
 }
 
@@ -641,7 +641,7 @@ static void test_StreamOnStreamRange(void)
 
     hr = IWICStream_CopyTo(pSubStream, CopyStream, uNewPos, NULL, NULL);
     ok(hr == E_NOTIMPL, "CopyTo returned %#x, expected %#x\n", hr, E_NOTIMPL);
-    IWICStream_Release(CopyStream);
+    IStream_Release(CopyStream);
 
 
     /* Commit */
@@ -733,7 +733,7 @@ static void test_StreamOnStreamRange(void)
 
     IWICStream_Release(pSubStream);
     IWICStream_Release(pStream);
-    IWICStream_Release(pFactory);
+    IWICImagingFactory_Release(pFactory);
     CoUninitialize();
 }