serial: report port-not-open in queueing commands via callback

Reporting errors instead of just returning permits routines like
mm-generic-gsm.c:simple_get_status() to work again, as their callbacks
get the error they are expecting. To make this work, adapt get_csq_done()
to handle a NULL response when error is set, and make sure that multiple
errors don't step on each other in the mm_callback_info_chain() sequence
created by simple_get_status().

Change-Id: Ie3a72b1ce71b7f117e8b1f3da7a406c4d2da9e02

0 files changed, 0 insertions, 0 deletions