tools: mkeficapsule: use %zd to print ssize_t.

For printing a ssize_t variable we must use %zd and not %ld to avoid
a -Wformat error on 32-bit systems.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
1 file changed