Uh, it is important that we don't set the local state 'local.close' to TRUE

until _after_ we're done as otherwise we might not get called again properly
to clean the entire thing since the close state is checked in
libssh2_channel_free

src/channel.c

@@ -2305,8 +2305,6 @@ channel_close(LIBSSH2_CHANNEL * channel)
         _libssh2_debug(session, LIBSSH2_DBG_CONN, "Closing channel %lu/%lu",
                        channel->local.id, channel->remote.id);
 
-        channel->local.close = 1;
-
         channel->close_packet[0] = SSH_MSG_CHANNEL_CLOSE;
         _libssh2_htonu32(channel->close_packet + 1, channel->remote.id);
 
@@ -2342,6 +2340,10 @@ channel_close(LIBSSH2_CHANNEL * channel)
         }
     }
 
+    /* set the local close state first when we're perfectly confirmed to not
+       do any more EAGAINs */
+    channel->local.close = 1;
+
     /* We call the callback last in this function to make it keep the local
        data as long as EAGAIN is returned. */
     if (channel->close_cb) {