[PATCH net-next 2/2] ppp: remove pch->chan NULL checks from tx path

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Content preview:  Now that ppp_disconnect_channel() is called before pch->chan
   is set to NULL, a channel from ppp->channels list on the transmit path is
   guaranteed to have non-NULL pch->chan. Remove the pch->chan NULL checks from
   ppp_push(), ppp_mp_explode(), and ppp_fill_forward_path(), where a channel
   is obtained from the list. Remove the corresponding WRITE/READ_ONCE annotations
   as they [...] 

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