(a12) unbreak regular shmif client forwarding

The directory work regressed some other parts thanks to a previously
omitted state transition in shmif-server (NOT_READY vs IDLE). The
a12cl-shmifsrv setup for forwarding a shmif client would just keep
producing video frames without synching to the encoder thread as
it expected NOT_READY as a signal for pause, instead of both that
and IDLE.

src/a12/a12.c

@@ -388,11 +388,8 @@ void a12int_append_out(struct a12_state* S, uint8_t type,
 
 static void reset_state(struct a12_state* S)
 {
-/* the 'reset' from an erroneous state is basically disconnect, just right
- * now it finishes and let validation failures etc. handle that particular
- * scenario */
 	S->left = header_sizes[STATE_NOPACKET];
-	if (S->state != STATE_1STSRV_PACKET)
+	if (S->state != STATE_1STSRV_PACKET && S->state != STATE_BROKEN)
 		S->state = STATE_NOPACKET;
 	S->decode_pos = 0;
 	S->in_channel = -1;
@@ -1675,6 +1672,11 @@ static void process_hello_auth(struct a12_state* S)
 			a12int_trace(A12_TRACE_SYSTEM, "kind=match:local=sink:remote=source");
 			S->remote_mode = ROLE_SOURCE;
 		}
+		else if (S->opts->local_role == ROLE_SINK && S->decode[54] == ROLE_SINK){
+			a12int_trace(A12_TRACE_SYSTEM, "kind=mismatch:local=sink:remote=sink");
+			fail_state(S);
+			return;
+		}
 /* client: we might just be probing, if so continue without matching */
 		else if (S->opts->local_role == ROLE_PROBE){
 		}

src/a12/net/a12_helper_srv.c

@@ -518,7 +518,9 @@ static void* client_thread(void* inarg)
 		}
 
 		int pv;
-		while ((pv = shmifsrv_poll(data->C)) != CLIENT_NOT_READY){
+		while (
+			(pv = shmifsrv_poll(data->C)) != CLIENT_NOT_READY &&
+			pv != CLIENT_IDLE){
 /* Dead client, send the close message and that should cascade down the rest
  * and kill relevant sockets. */
 			if (pv == CLIENT_DEAD){

src/a12/net/dir_cl.c

@@ -709,7 +709,7 @@ static bool cl_got_dir(struct ioloop_shared* I, struct appl_meta* dir)
 			cbt->clopt->outapp.appl.name
 		);
 
-/* this ignores die-on-list */
+		I->shutdown = true;
 		return true;
 	}