fix memory corruption #570
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If channel calls sm_exec_end before calling the callbacks, it's possible that the channel will close before the callbacks get called. Depending on the callbacks, this can lead to memory corruption. In my case, geo_core was calling channel_close, and channel_close was returning (after sm_exec_end was called). Then geo_core_destroy was called, and finally the channel callback(operation_rc_ptr_dispose) was called . This referred to a dead geo_core pointer, and it crashed.