This will eventually be used by 'gotadmin pack'. Checksum init and finalization will need to be done by the caller since many objects will be written out in compressed form while we are computing checksums across the entire pack file. ok millert, naddy

Code which inserts a reference into a reflist passes ownership of this reference to the list. However, got_ref_list_free() never closed such references, which resulted in a memory leak. ok tracey

Avoids an error where tog(1) would exit with "poll: Interrupted system call" while the terminal window was being resized. ok millert

Patch by Nam Nguyen

one of these tests is still failing; there is another edge case left to fix

problem found by jrick ok millert

This fixes spurious 'U' notifications for symlinks during 'got update' that occurred even when the work tree was fully up-to-date. Observed on a work tree of the FreeBSD src repo and reproduced in our test suite by adding a no-op update at the end of a test which deals with updating symlinks.

Condense error checking to reduce a future diff moving those lines around; this pattern is already used in other parts of the tree. fine stsp ok tracey

suggested by mpi@ ages ago