CLEANUP/MINOR: dns: dns_str_to_dn_label() only needs a const char
The string is an input, let's constify it.
diff --git a/include/proto/dns.h b/include/proto/dns.h
index 328298e..80887e8 100644
--- a/include/proto/dns.h
+++ b/include/proto/dns.h
@@ -25,7 +25,7 @@
#include <types/dns.h>
#include <types/proto_udp.h>
-char *dns_str_to_dn_label(char *string, char *dn, int dn_len);
+char *dns_str_to_dn_label(const char *string, char *dn, int dn_len);
int dns_str_to_dn_label_len(const char *string);
int dns_hostname_validation(const char *string, char **err);
int dns_build_query(int query_id, int query_type, char *hostname_dn, int hostname_dn_len, char *buf, int bufsize);