FROMGIT: platform/chrome: cros_ec_typec: Check ec platform device pointer

It is possible that parent device for cros_ec_typec device is already
available, but ec pointer in parent driver data isn't populated yet. It
may happen when cros_typec_probe is running in parallel with
cros_ec_register. This leads to NULL pointer dereference when
cros_typec_probe tries to get driver data from typec->ec->ec->dev.

Check if typec->ec->ec is set before using it in cros_typec_probe.

Signed-off-by: Tomasz Michalec <tmichalec@google.com>
Link: https://lore.kernel.org/r/20250722132826.707087-1-tmichalec@google.com


Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

Bug: 433230660
(cherry picked from commit 731a4702
 https://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux.git


 for-next)
Change-Id: Ib0403453623f8174d30e7e448dc9e1ad20b11047
Signed-off-by: Tomasz Michalec <tmichalec@google.com>