ddraw: Clear application-passed lpSurface pointers.

dlls/ddraw/surface.c

@@ -6224,6 +6224,7 @@ HRESULT ddraw_surface_init(struct ddraw_surface *surface, struct ddraw *ddraw, s
             desc->u1.lPitch = wined3d_surface_get_pitch(wined3d_surface);
         }
     }
+    desc->lpSurface = NULL;
 
     wined3d_surface_incref(wined3d_surface);
     surface->wined3d_surface = wined3d_surface;

dlls/ddraw/tests/ddraw1.c

@@ -4576,6 +4576,7 @@ static void test_create_surface_pitch(void)
             ok(U1(surface_desc).lPitch == test_data[i].pitch_out32,
                     "Test %u: Got unexpected pitch %u, expected %u.\n",
                     i, U1(surface_desc).lPitch, test_data[i].pitch_out32);
+        ok(!surface_desc.lpSurface, "Test %u: Got unexpected lpSurface %p.\n", i, surface_desc.lpSurface);
 
         IDirectDrawSurface_Release(surface);
     }

dlls/ddraw/tests/ddraw2.c

@@ -5652,6 +5652,7 @@ static void test_create_surface_pitch(void)
             ok(U1(surface_desc).lPitch == test_data[i].pitch_out32,
                     "Test %u: Got unexpected pitch %u, expected %u.\n",
                     i, U1(surface_desc).lPitch, test_data[i].pitch_out32);
+        ok(!surface_desc.lpSurface, "Test %u: Got unexpected lpSurface %p.\n", i, surface_desc.lpSurface);
 
         IDirectDrawSurface_Release(surface);
     }

dlls/ddraw/tests/ddraw4.c

@@ -6649,6 +6649,7 @@ static void test_create_surface_pitch(void)
             ok(U1(surface_desc).lPitch == test_data[i].pitch_out32,
                     "Test %u: Got unexpected pitch %u, expected %u.\n",
                     i, U1(surface_desc).lPitch, test_data[i].pitch_out32);
+        ok(!surface_desc.lpSurface, "Test %u: Got unexpected lpSurface %p.\n", i, surface_desc.lpSurface);
 
         IDirectDrawSurface4_Release(surface);
     }

dlls/ddraw/tests/ddraw7.c

@@ -6472,6 +6472,7 @@ static void test_create_surface_pitch(void)
             ok(U1(surface_desc).lPitch == test_data[i].pitch_out32,
                     "Test %u: Got unexpected pitch %u, expected %u.\n",
                     i, U1(surface_desc).lPitch, test_data[i].pitch_out32);
+        ok(!surface_desc.lpSurface, "Test %u: Got unexpected lpSurface %p.\n", i, surface_desc.lpSurface);
 
         IDirectDrawSurface7_Release(surface);
     }