Fix https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=8618 :

Allow port 0 in RSA Key List.

(This has been broken since r36875.)

svn path=/trunk/; revision=49111

epan/dissectors/packet-ssl-utils.c

@@ -4078,7 +4078,7 @@ ssldecrypt_uat_fld_port_chk_cb(void* r _U_, const char* p, guint len _U_, const
 
     if (strcmp(p, "start_tls") != 0){
         const gint i = atoi(p);
-        if (i <= 0 || i > 65535) {
+        if (i < 0 || i > 65535) {
             *err = ep_strdup_printf("Invalid port given.");
             return FALSE;
         }