net/local: Remove the unused lc_psock from local_conn_s

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

net/local/local.h

@@ -143,7 +143,6 @@ struct local_conn_s
   /* SOCK_STREAM fields common to both client and server */
 
   sem_t lc_waitsem;            /* Use to wait for a connection to be accepted */
-  FAR struct socket *lc_psock; /* A reference to the socket structure */
 
   /* The following is a list if poll structures of threads waiting for
    * socket events.

net/local/local_accept.c

@@ -150,8 +150,6 @@ int local_accept(FAR struct socket *psock, FAR struct sockaddr *addr,
 
           /* Setup the accpet socket structure */
 
-          conn->lc_psock = newsock;
-
           newsock->s_domain = psock->s_domain;
           newsock->s_type   = SOCK_STREAM;
           newsock->s_sockif = psock->s_sockif;

net/local/local_sockif.c

@@ -148,9 +148,6 @@ static int local_sockif_alloc(FAR struct socket *psock)
   /* Save the pre-allocated connection in the socket structure */
 
   psock->s_conn = conn;
-#if defined(CONFIG_NET_LOCAL_STREAM)
-  conn->lc_psock = psock;
-#endif
   return OK;
 }
 #endif