Use %zu to print resid (size_t).

Print resid (size_t) portably.

Signed-off-by: Mohan Srinivasan <srmohan@google.com>
Change-Id: Ic5c9dc498bfeef2be21594ec5efd45a98a3c4b4d
(cherry picked from commit a1e4c795e1b6de6b34b8cbc75499d1675608c36b)