advapi32: add a couple testcases for GetNamedSecurityInfo (try 3)

[Austin English]

Added win_skip for NT4, where it would crash (thanks Paul!).

-- 
-Austin
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diff --git a/dlls/advapi32/tests/security.c b/dlls/advapi32/tests/security.c
index f775d10..82961e1 100644
--- a/dlls/advapi32/tests/security.c
+++ b/dlls/advapi32/tests/security.c
@@ -2569,6 +2569,25 @@ static void test_GetNamedSecurityInfoA(void)
     }
     ok(!error, "GetNamedSecurityInfo failed with error %d\n", error);
 
+    /* Test with a NULL ObjectName */
+    SetLastError(0xdeadbeef);
+    error = pGetNamedSecurityInfoA(NULL, SE_FILE_OBJECT,
+        OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION|DACL_SECURITY_INFORMATION,
+        NULL, NULL, NULL, NULL, &pSecDesc);
+    ok(error == ERROR_INVALID_PARAMETER, "GetNamedSecurityInfoA should've returned ERROR_INVALID PARAMETER, got %d\n", error);
+
+    /* Test with a NULL descriptor */
+    if(!pCreateWellKnownSid)
+        win_skip("Crashes on NT4\n");
+    else
+    {
+    SetLastError(0xdeadbeef);
+    error = pGetNamedSecurityInfoA(windows_dir, SE_FILE_OBJECT,
+        OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION|DACL_SECURITY_INFORMATION,
+        NULL, NULL, NULL, NULL, NULL);
+    ok(error == ERROR_INVALID_PARAMETER, "GetNamedSecurityInfoA should've returned ERROR_INVALID PARAMETER, got %d\n", error);
+    }
+
     ret = GetSecurityDescriptorControl(pSecDesc, &control, &revision);
     ok(ret, "GetSecurityDescriptorControl failed with error %d\n", GetLastError());
     ok((control & (SE_SELF_RELATIVE|SE_DACL_PRESENT)) == (SE_SELF_RELATIVE|SE_DACL_PRESENT) ||