NFC: Keep socket alive until the DISC PDU is actually sent

This patch keeps the socket alive and therefore does not remove
it from the sockets list in the local until the DISC PDU has been
actually sent. Otherwise we would reply with DM PDUs before sending
the DISC one.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/net/nfc/llcp.h b/net/nfc/llcp.h
index ac16ebe..71f649e 100644
--- a/net/nfc/llcp.h
+++ b/net/nfc/llcp.h
@@ -19,6 +19,7 @@
 
 enum llcp_state {
 	LLCP_CONNECTED = 1, /* wait_for_packet() wants that */
+	LLCP_DISCONNECTING,
 	LLCP_CLOSED,
 	LLCP_BOUND,
 	LLCP_LISTEN,