Fixed dname case-sensitive comparation

- If case-sensitive, do not compare just pointers.

refs #776

src/dnslib/dname.c

@@ -281,7 +281,7 @@ DEBUG_DNSLIB_DNAME(
 	free(name2);
 );
 
-	if (d1 == d2) {
+	if (!cs && d1 == d2) {
 		return 0;
 	}