urlmon: IsValidUrl should not fail if first parameter is not NULL.

dlls/urlmon/tests/misc.c

@@ -1454,9 +1454,20 @@ static void test_MkParseDisplayNameEx(void)
 static void test_IsValidURL(void)
 {
     HRESULT hr;
+    IBindCtx *bctx = NULL;
 
     hr = IsValidURL(NULL, 0, 0);
     ok(hr == E_INVALIDARG, "Expected E_INVALIDARG, got %08x\n", hr);
+
+    hr = IsValidURL(NULL, wszHttpWineHQ, 0);
+    ok(hr == S_OK, "Expected S_OK, got %08x\n", hr);
+
+    CreateBindCtx(0, &bctx);
+
+    hr = IsValidURL(bctx, wszHttpWineHQ, 0);
+    ok(hr == S_OK, "Expected S_OK, got %08x\n", hr);
+
+    IBindCtx_Release(bctx);
 }
 
 START_TEST(misc)

dlls/urlmon/urlmon_main.c

@@ -426,7 +426,7 @@ HRESULT WINAPI DllRegisterServerEx(void)
  * Determines if a specified string is a valid URL.
  *
  * PARAMS
- *  pBC        [I] ignored, must be NULL.
+ *  pBC        [I] ignored, should be NULL.
  *  szURL      [I] string that represents the URL in question.
  *  dwReserved [I] reserved and must be zero.
  *
@@ -442,7 +442,7 @@ HRESULT WINAPI IsValidURL(LPBC pBC, LPCWSTR szURL, DWORD dwReserved)
 {
     FIXME("(%p, %s, %d): stub\n", pBC, debugstr_w(szURL), dwReserved);
 
-    if (pBC || dwReserved || !szURL)
+    if (dwReserved || !szURL)
         return E_INVALIDARG;
 
     return S_OK;