From: Jakub Audykowicz <redacted>
Date: Thu,  6 Dec 2018 08:58:37 +0100

My previous patch introduced a compilation warning regarding a type
mismatch (int vs size_t). This is a one-letter fix for good housekeeping.

Signed-off-by: Jakub Audykowicz <redacted>

Still wrong and I fixed it when I applied your patch.

You need to use the 'Z' prefix for size_t, so %Zu in this case.