7ef082733b
Apparently some large-file systems out there, such as my powerpc64le Linux box, define daddr_t as a 32-bit type, which is sad and stymies cross-building disk images. Cast daddr_t to off_t before doing arithmetic that overflows. Reviewed by: arichardson, jrtc27, imp MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D27458