verify: fix integer sizes in verify state file

verify: fix integer sizes in verify state file

nofiles and depth are 32-bit integers. So we shouldn't use 64-bit
conversion functions and casts. The current code actually works fine on
little-endian platforms since the conversion is a noop but this is
broken on big-endian platforms.

Fixes: 94a6e1bb ("Fix verify state for multiple files")
Signed-off-by: Vincent Fu <vincent.fu@samsung.com>