Was causing a very small leak on naptr lookups. Upon review just happened to be…

Was causing a very small leak on naptr lookups. Upon review just happened to be a typo missing a bang.

src/mod/applications/mod_enum/mod_enum.c

@@ -312,7 +312,7 @@ static void parse_naptr(const ldns_rr *naptr, const char *number, enum_record_t
 
 	char *regex, *replace;
 	
-	if (zstr(str)) {
+	if (!zstr(str)) {
 		return;
 	}