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stm: Goes into weird state at shutdown when the module is already suspended

To reproduce:

  • open gnss-share's socket
  • send $PSTMGPSSUSPEND to the module behind gnss-share's back
  • close gnss-share's socket

Expected result: gnss-share closes its FD and the module powers off.

Observed result: gnss-share goes into some weird state where it keeps its FD open indefinitely.

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