d3d8: Do not modify the "surface" pointer for D3DFMT_UNKNOWN in d3d8_device_CreateRenderTarget().

dlls/d3d8/device.c

@@ -990,6 +990,9 @@ static HRESULT WINAPI d3d8_device_CreateRenderTarget(IDirect3DDevice8 *iface, UI
     TRACE("iface %p, width %u, height %u, format %#x, multisample_type %#x, lockable %#x, surface %p.\n",
             iface, width, height, format, multisample_type, lockable, surface);
 
+    if (!format)
+        return D3DERR_INVALIDCALL;
+
     *surface = NULL;
     if (lockable)
         flags |= WINED3D_TEXTURE_CREATE_MAPPABLE;

dlls/d3d8/tests/device.c

@@ -8212,7 +8212,7 @@ static void test_format_unknown(void)
     hr = IDirect3DDevice8_CreateRenderTarget(device, 64, 64,
             D3DFMT_UNKNOWN, D3DMULTISAMPLE_NONE, FALSE, (IDirect3DSurface8 **)&iface);
     ok(hr == D3DERR_INVALIDCALL, "Got unexpected hr %#x.\n", hr);
-    todo_wine ok(iface == (void *)0xdeadbeef, "Got unexpected iface %p.\n", iface);
+    ok(iface == (void *)0xdeadbeef, "Got unexpected iface %p.\n", iface);
 
     iface = (void *)0xdeadbeef;
     hr = IDirect3DDevice8_CreateDepthStencilSurface(device, 64, 64,