comctl32/tests: Remove superfluous casts.

dlls/comctl32/tests/listview.c

@@ -3293,7 +3293,7 @@ static void test_getitemrect(void)
     expect(18, rect.left);
     expect(50, rect.right);
 
-    r = SendMessage(hwnd, LVM_SETIMAGELIST, LVSIL_STATE, (LPARAM)NULL);
+    r = SendMessage(hwnd, LVM_SETIMAGELIST, LVSIL_STATE, 0);
     ok(r != 0, "should return current list handle\n");
 
     r = SendMessage(hwnd, LVM_SETIMAGELIST, LVSIL_SMALL, (LPARAM)himl);

dlls/comctl32/tests/monthcal.c

@@ -968,7 +968,7 @@ static void test_monthcal_hittest(void)
     expect(-1, res);
     expect(0, mchit.uHit);
     /* test with invalid pointer */
-    res = SendMessage(hwnd, MCM_HITTEST, 0, (LPARAM)NULL);
+    res = SendMessage(hwnd, MCM_HITTEST, 0, 0);
     expect(-1, res);
 
     /* resize control to display single Calendar */