Adjust the semantics of cfg.remote_cmd_ptr: it is now NULL when

cfg.remote_cmd is to be used, rather than actually pointing at
cfg.remote_cmd. This change restores the ability to structure-copy
Configs without breaking them. (Though of course this is only a
temporary solution: really what wants doing is to fix
`config-struct'.)

[originally from svn r5335]

config.c

@@ -402,7 +402,7 @@ static void sessionsaver_handler(union control *ctrl, void *dlg,
 		/* If at this point we have a valid session, go! */
 		if (*cfg2.host) {
 		    *cfg = cfg2;       /* structure copy */
-		    cfg->remote_cmd_ptr = cfg->remote_cmd; /* nasty */
+		    cfg->remote_cmd_ptr = NULL;
 		    dlg_end(dlg, 1);
 		} else
 		    dlg_beep(dlg);

settings.c

@@ -406,7 +406,7 @@ void load_open_settings(void *sesskey, int do_host, Config *cfg)
     char prot[10];
 
     cfg->ssh_subsys = 0;	       /* FIXME: load this properly */
-    cfg->remote_cmd_ptr = cfg->remote_cmd;
+    cfg->remote_cmd_ptr = NULL;
     cfg->remote_cmd_ptr2 = NULL;
 
     if (do_host) {

ssh.c

@@ -4619,6 +4619,8 @@ static void do_ssh1_connection(Ssh ssh, unsigned char *in, int inlen,
     {
 	char *cmd = ssh->cfg.remote_cmd_ptr;
 
+	if (!cmd) cmd = ssh->cfg.remote_cmd;
+	
 	if (ssh->cfg.ssh_subsys && ssh->cfg.remote_cmd_ptr2) {
 	    cmd = ssh->cfg.remote_cmd_ptr2;
 	    ssh->fallback_cmd = TRUE;
@@ -7323,6 +7325,7 @@ static void do_ssh2_authconn(Ssh ssh, unsigned char *in, int inlen,
 	} else {
 	    subsys = ssh->cfg.ssh_subsys;
 	    cmd = ssh->cfg.remote_cmd_ptr;
+	    if (!cmd) cmd = ssh->cfg.remote_cmd;
 	}
 
 	s->pktout = ssh2_pkt_init(SSH2_MSG_CHANNEL_REQUEST);