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libqmi-glib,device: endpoint is cleared when device is closed

Aleksander Morgado requested to merge aleksm/libqmi:aleksander/fix-segfault into master 
  #0  qmi_endpoint_is_open (self=0x0) at ../../../libqmi-1.24.8/src/libqmi-glib/qmi-endpoint.c:180
  #1  0x00007ffff7caf275 in qmi_device_command_abortable (self=self@entry=0x7fffe8006f00, message=message@entry=0x5555557e7330, message_context=message_context@entry=0x0, timeout=timeout@entry=30,
      abort_build_request_fn=abort_build_request_fn@entry=0x0, abort_parse_response_fn=abort_parse_response_fn@entry=0x0, abort_user_data=0x0, abort_user_data_free=0x0, cancellable=0x5555557e8a50,
      callback=0x7ffff7caf620 <transaction_abort_ready>, user_data=0x1120016) at ../../../libqmi-1.24.8/src/libqmi-glib/qmi-device.c:2301
  #2  0x00007ffff7caf87b in qmi_device_command_full (self=self@entry=0x7fffe8006f00, message=message@entry=0x5555557e7330, message_context=message_context@entry=0x0, timeout=timeout@entry=30,
      cancellable=<optimized out>, callback=callback@entry=0x7ffff7caf620 <transaction_abort_ready>, user_data=0x1120016) at ../../../libqmi-1.24.8/src/libqmi-glib/qmi-device.c:2375
  #3  0x00007ffff7caf966 in transaction_abort (self=0x7fffe8006f00, tr=tr@entry=0x7fffe0009800, abort_error_take=0x5555557fc3b0) at ../../../libqmi-1.24.8/src/libqmi-glib/qmi-device.c:361
  #4  0x00007ffff7cafaf5 in transaction_timed_out (ctx=0x5555557b8690, ctx@entry=<error reading variable: value has been optimized out>) at ../../../libqmi-1.24.8/src/libqmi-glib/qmi-device.c:385
  #5  0x00007ffff7809f94 in g_timeout_dispatch (source=0x5555558116b0, callback=<optimized out>, user_data=<optimized out>) at ../glib-2.60.7/glib/gmain.c:4678
  #6  0x00007ffff78094ef in g_main_dispatch (context=0x55555570c670) at ../glib-2.60.7/glib/gmain.c:3189
  #7  g_main_context_dispatch (context=context@entry=0x55555570c670) at ../glib-2.60.7/glib/gmain.c:3854
  #8  0x00007ffff78098c0 in g_main_context_iterate (context=0x55555570c670, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib-2.60.7/glib/gmain.c:3927
  #9  0x00007ffff7809bd3 in g_main_loop_run (loop=0x5555557233e0) at ../glib-2.60.7/glib/gmain.c:4123
  #10 0x000055555559bbc0 in main (argc=<optimized out>, argv=<optimized out>) at ../../ModemManager-1.12.8/src/main.c:206

Fixes #37 (closed)

Edited by Aleksander Morgado

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