Bugfix in dnslib_dname_compare().

fixes #140

src/dnslib/dname.c

@@ -242,16 +242,16 @@ int dnslib_dname_compare( const dnslib_dname_t *d1, const dnslib_dname_t *d2 )
 	int i2 = 0;
 
 	const uint8_t *pos1 = dnslib_dname_name(d1);
-	const uint8_t *pos2 = dnslib_dname_name(d1);
+	const uint8_t *pos2 = dnslib_dname_name(d2);
 
 	while (*pos1 != '\0') {
 		labels1[i1++] = pos1;
-		pos1 += *pos1;
+		pos1 += *pos1 + 1;
 	}
 
 	while (*pos2 != '\0') {
 		labels2[i2++] = pos2;
-		pos2 += *pos2;
+		pos2 += *pos2 + 1;
 	}
 
 	// compare labels from last to first