shlwapi: Fix a failing test.

dlls/shlwapi/tests/path.c

@@ -481,7 +481,7 @@ static void test_UrlEscape(void)
     unsigned int i;
 
     ret = UrlEscapeA("/woningplan/woonkamer basis.swf", NULL, &size, URL_ESCAPE_SPACES_ONLY);
-    ok(ret == E_POINTER, "got %x, expected %x\n", ret, E_POINTER);
+    ok(ret == E_INVALIDARG, "got %x, expected %x\n", ret, E_INVALIDARG);
 
     for(i=0; i<sizeof(TEST_ESCAPE)/sizeof(TEST_ESCAPE[0]); i++) {
         test_url_escape(TEST_ESCAPE[i].url, TEST_ESCAPE[i].flags,

dlls/shlwapi/url.c

@@ -844,7 +844,7 @@ HRESULT WINAPI UrlEscapeA(
             *pcchEscaped = lenA;
         } else {
             *pcchEscaped = lenA + 1;
-            ret = E_POINTER;
+            ret = E_INVALIDARG;
         }
     }
     if(escapedW != bufW) HeapFree(GetProcessHeap(), 0, escapedW);