There is a plenty of arch's out there where sizeof(size_t) != sizeof(int).

There is a plenty of arch's out there where sizeof(size_t) != sizeof(int).
A field width in printf(3) must be int, so cast return value from strlen()
to the type.

Noticed by:	Andrzej Tobola <ato iem pw edu pl>; tinderbox
Pointy hat to:	yar
X-MFC with:	the rest of the new asf code