hidraw(4): update hgd_actlen in HIDRAW_GET_REPORT ioctl

HIDRAW_GET_REPORT ioctl is documented to update hgd_actlen on return
with the number of bytes copied. It does not do this.

Reviewed by: wulf
PR: 282790
MFC after: 1 week

(cherry picked from commit f4f46a2eef3be6d19c65a4ca4ee70f365dd5be4f)