shdocvw/tests: don't check return values inside of if(0) (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/shdocvw/tests/shdocvw.c b/dlls/shdocvw/tests/shdocvw.c
index 17ea8d0..e7c904b 100644
--- a/dlls/shdocvw/tests/shdocvw.c
+++ b/dlls/shdocvw/tests/shdocvw.c
@@ -268,7 +268,7 @@ static void test_ParseURLFromOutsideSourceA(void)
 
         if (0) {
             /* that test crash on native shdocvw */
-            res = pParseURLFromOutsideSourceA(ParseURL_table[i].url, buffer, NULL, &dummy);
+            pParseURLFromOutsideSourceA(ParseURL_table[i].url, buffer, NULL, &dummy);
         }
 
         memset(buffer, '#', sizeof(buffer)-1);