drm/bridge: it6505: Move a variable assignment behind a null pointer check in receive_timing_debugfs_show()

[Markus Elfring]

> Fix the email Sign-off email != Sender email issue, resubmit and I'll
> be able to apply this.

You can pick the email from my tag “Signed-off-by” up also directly
as an ordinary patch author email, can't you?

Regards,
Markus