Networking: Fix a major TCP bug introduced with commit...

Networking:  Fix a major TCP bug introduced with commit e71c09ce9777ff732cb60bd07fb43d85522f79d6.  Some connection logic was reorder -- setting the socket got moved BEFORE the point where the check was made if the socket was already connected.  The resulting behavior was odd:  Telnet would connect, but then when you exit and reconnect, it would fail to connect.  But then if try again, it would connect okay. So the symptom was connect-fail-connect-fail-...

net/socket/accept.c

@@ -185,7 +185,7 @@ int accept(int sockfd, FAR struct sockaddr *addr, FAR socklen_t *addrlen)
 
   if (addr)
     {
-      /* If an address is provided, then the lenght must also be provided. */
+      /* If an address is provided, then the length must also be provided. */
 
       DEBUGASSERT(addrlen);
 
@@ -258,8 +258,6 @@ int accept(int sockfd, FAR struct sockaddr *addr, FAR socklen_t *addrlen)
 
   pnewsock->s_domain = psock->s_domain;
   pnewsock->s_type   = SOCK_STREAM;
-  pnewsock->s_flags |= _SF_CONNECTED;
-  pnewsock->s_flags &= ~_SF_CLOSED;
 
   /* Perform the correct accept operation for this address domain */
 
@@ -306,6 +304,10 @@ int accept(int sockfd, FAR struct sockaddr *addr, FAR socklen_t *addrlen)
     }
 #endif /* CONFIG_NET_TCP */
 
+  /* Mark the socket as connected. */
+
+  pnewsock->s_flags |= _SF_CONNECTED;
+  pnewsock->s_flags &= ~_SF_CLOSED;
   return newfd;
 
 errout_with_socket: