Don't erase every buffer, it's too time consuming.

On systems where it matters encrypted swap should be enabled anyway.

--HG--
extra : convert_revision : 6cb7793493d92968e09b5dea21d71ded5811d21f

process-packet.c

@@ -119,7 +119,6 @@ void process_packet() {
 	recv_unimplemented();
 
 out:
-	buf_burn(ses.payload); /* Clear the memory to avoid swapping it out */
 	buf_free(ses.payload);
 	ses.payload = NULL;