oleaut32/tests: Simplify the check for an empty string (PVS-Studio).

dlls/oleaut32/tests/vartest.c

@@ -295,16 +295,14 @@ static void init(void)
     HRESULT res;
 
     res = VarBstrFromBool(VARIANT_TRUE, LANG_USER_DEFAULT, VAR_LOCALBOOL, &bstr);
-    ok(res == S_OK && (lstrlenW(bstr) > 0),
-        "Expected localized string for 'True'\n");
+    ok(res == S_OK && bstr[0], "Expected localized string for 'True'\n");
     /* lstrcpyW / lstrcatW do not work on win95 */
     memcpy(sz12_true, sz12, sizeof(sz12));
     if (bstr) memcpy(&sz12_true[2], bstr, SysStringByteLen(bstr) + sizeof(WCHAR));
     SysFreeString(bstr);
 
     res = VarBstrFromBool(VARIANT_FALSE, LANG_USER_DEFAULT, VAR_LOCALBOOL, &bstr);
-    ok(res == S_OK && (lstrlenW(bstr) > 0),
-        "Expected localized string for 'False'\n");
+    ok(res == S_OK && bstr[0], "Expected localized string for 'False'\n");
     memcpy(sz12_false, sz12, sizeof(sz12));
     if (bstr) memcpy(&sz12_false[2], bstr, SysStringByteLen(bstr) + sizeof(WCHAR));
     SysFreeString(bstr);