channels: Handle SSH_AGAIN in channel_open().

src/channels.c

@@ -296,11 +296,14 @@ static int channel_open(ssh_channel channel, const char *type_c, int window,
   /* Todo: fix this into a correct loop */
   /* wait until channel is opened by server */
   while(channel->state == SSH_CHANNEL_STATE_NOT_OPEN){
-    ssh_handle_packets(session, -2);
-    if (session->session_state == SSH_SESSION_STATE_ERROR) {
-        err = SSH_ERROR;
-        break;
-    }
+      err = ssh_handle_packets(session, -2);
+      if (err != SSH_OK) {
+          break;
+      }
+      if (session->session_state == SSH_SESSION_STATE_ERROR) {
+          err = SSH_ERROR;
+          break;
+      }
   }
   if(channel->state == SSH_CHANNEL_STATE_OPEN)
     err=SSH_OK;

src/session.c

@@ -464,18 +464,12 @@ int ssh_handle_packets(ssh_session session, int timeout) {
         tm = ssh_make_milliseconds(session->timeout, session->timeout_usec);
     }
     rc = ssh_poll_ctx_dopoll(ctx, tm);
-
     if (rc == SSH_ERROR) {
         session->session_state = SSH_SESSION_STATE_ERROR;
     }
 
     leave_function();
-
-    if (session->session_state == SSH_SESSION_STATE_ERROR) {
-        return SSH_ERROR;
-    }
-
-    return SSH_OK;
+    return rc;
 }
 
 /**