gpio: cdev: Avoid NULL dereference in linehandle_create()

gpio: cdev: Avoid NULL dereference in linehandle_create()

In linehandle_create(), there is a statement like this:
  retain_and_null_ptr(lh);

Soon after, there is a debug printout that dereferences "lh", which
will crash things.

Avoid the crash by using handlereq.lines, which is the same value.

Fixes: da7e394bf58f ("gpio: convert linehandle_create() to FD_PREPARE()")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patch.msgid.link/20260215120555.v2.1.I77c3eb563271c21870379eefd16ebbc4e09635bb@changeid
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>