amstream: Return E_POINTER on NULL stream in IMediaStreamFilter::GetMediaStream().

dlls/amstream/filter.c

@@ -513,6 +513,9 @@ static HRESULT WINAPI filter_GetMediaStream(IMediaStreamFilter *iface, REFMSPID
 
     TRACE("(%p)->(%s,%p)\n", iface, debugstr_guid(idPurpose), ppMediaStream);
 
+    if (!ppMediaStream)
+        return E_POINTER;
+
     for (i = 0; i < This->nb_streams; i++)
     {
         IAMMediaStream_GetInformation(This->streams[i], &purpose_id, NULL);

dlls/amstream/tests/amstream.c

@@ -701,9 +701,13 @@ static void test_add_stream(void)
     ok(hr == S_FALSE, "Got hr %#x.\n", hr);
 
     hr = IAMMultiMediaStream_GetMediaStream(mmstream, &MSPID_PrimaryAudio, NULL);
-    todo_wine ok(hr == E_POINTER, "Got hr %#x.\n", hr);
+    ok(hr == E_POINTER, "Got hr %#x.\n", hr);
     hr = IMediaStreamFilter_GetMediaStream(stream_filter, &MSPID_PrimaryAudio, NULL);
-    todo_wine ok(hr == E_POINTER, "Got hr %#x.\n", hr);
+    ok(hr == E_POINTER, "Got hr %#x.\n", hr);
+    hr = IAMMultiMediaStream_GetMediaStream(mmstream, &MSPID_PrimaryVideo, NULL);
+    ok(hr == E_POINTER, "Got hr %#x.\n", hr);
+    hr = IMediaStreamFilter_GetMediaStream(stream_filter, &MSPID_PrimaryVideo, NULL);
+    ok(hr == E_POINTER, "Got hr %#x.\n", hr);
 
     check_enum_stream(mmstream, stream_filter, 0, NULL);