staging: r8188eu: remove _cancel_timer wrapper

Remove the _cancel_timer wrapper function and call del_timer_sync
directly.

None of the callers needs the bcancelled variable that's populated by
_cancel_timer, these variables can be removed in the calling functions.

rtw_surveydone_event_callback calls _cancel_timer only if it believes
that the timer is currently running. We can drop this. It's safe to
call del_timer_sync when the timer is not running. The timer in question,
scan_to_timer, is used only for the site survey command (the rtw_survey
functions) so we won't be stopping it while it's in use by someone else.

Signed-off-by: Martin Kaiser <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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