Fix up handling of lost connections.

Was spinning at 100% CPU on a lost connection if sftp was active.

src/syncterm/ssh.c

@@ -189,7 +189,8 @@ ssh_input_thread(void *args)
 		}
 		else {
 			gchstatus = CRYPT_OK;
-			chan = -1;
+			if (!cryptStatusError(popstatus))
+				chan = -1;
 		}
 		pthread_mutex_unlock(&ssh_mutex);
 
@@ -224,10 +225,16 @@ ssh_input_thread(void *args)
 		if (cryptStatusError(popstatus)) {
 			if ((popstatus == CRYPT_ERROR_COMPLETE) || (popstatus == CRYPT_ERROR_READ)) { /* connection closed */
 				pthread_mutex_lock(&ssh_mutex);
-				if (chan == ssh_channel) {
-					pthread_mutex_unlock(&ssh_mutex);
-					break;
+				status = cl.SetAttribute(ssh_session, CRYPT_SESSINFO_SSH_CHANNEL, chan);
+				if (status != CRYPT_ERROR_NOTFOUND) {
+					cl.SetAttribute(ssh_session, CRYPT_SESSINFO_SSH_CHANNEL_ACTIVE, 0);
+					if (chan == ssh_channel) {
+						pthread_mutex_unlock(&ssh_mutex);
+						break;
+					}
 				}
+				if (chan == sftp_channel)
+					sftp_channel = -1;
 				pthread_mutex_unlock(&ssh_mutex);
 			}
 			else {