drm/i915: fix up merge with usb-next branch

drm/i915: fix up merge with usb-next branch

In the manual fixup of the list_count_nodes() logic in
drivers/gpu/drm/i915/gt/intel_execlists_submission.c in the usb-next
branch, I missed that the print modifier was incorrect, resulting in
loads of build warnings on 32bit systems.

Fix this up by using "%su" instead of "%lu".

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 924fb3ec50f5 ("Merge 6.2-rc7 into usb-next")
Link: https://lore.kernel.org/r/20230206124422.2266892-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>