inetcomm: Return S_FALSE if no data is returned in IInternetProtocol::Read.

dlls/inetcomm/protocol.c

@@ -564,10 +564,18 @@ static HRESULT WINAPI MimeHtmlProtocol_Resume(IInternetProtocol *iface)
 static HRESULT WINAPI MimeHtmlProtocol_Read(IInternetProtocol *iface, void* pv, ULONG cb, ULONG* pcbRead)
 {
     MimeHtmlProtocol *This = impl_from_IInternetProtocol(iface);
+    ULONG read = 0;
+    HRESULT hres;
 
     TRACE("(%p)->(%p %u %p)\n", This, pv, cb, pcbRead);
 
-    return IStream_Read(This->stream, pv, cb, pcbRead);
+    hres = IStream_Read(This->stream, pv, cb, &read);
+    if(pcbRead)
+        *pcbRead = read;
+    if(hres != S_OK)
+        return hres;
+
+    return read ? S_OK : S_FALSE;
 }
 
 static HRESULT WINAPI MimeHtmlProtocol_Seek(IInternetProtocol *iface, LARGE_INTEGER dlibMove,

dlls/inetcomm/tests/mimeole.c

@@ -1368,6 +1368,8 @@ static HRESULT WINAPI ProtocolSink_ReportData(IInternetProtocolSink *iface, DWOR
     buf[read] = 0;
     ok(!strcmp(buf, current_binding_test->data), "unexpected data: %s\n", buf);
 
+    hres = IInternetProtocol_Read(current_binding_protocol, buf, sizeof(buf), &read);
+    ok(hres == S_FALSE, "Read failed: %08x\n", hres);
     return S_OK;
 }