libsmb: Make sure that the TCP socket is non-blocking

All traffic goes through smbXcli_base.c, and that is prepared to deal
with short writes via the conn->outgoing queue. Instead of making sure
that all callers properly set the socket nonblocking, do it here, so
that we can later optimize sending out data to the server.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>

libcli/smb/smbXcli_base.c

@@ -338,6 +338,7 @@ struct smbXcli_conn *smbXcli_conn_create(TALLOC_CTX *mem_ctx,
 		return NULL;
 	}
 
+	set_blocking(fd, false);
 	conn->sock_fd = fd;
 
 	conn->remote_name = talloc_strdup(conn, remote_name);