Merge branch 'rs/reftable-realloc-errors'

The custom allocator code in the reftable library did not handle failing realloc() very well, which has been addressed. * rs/reftable-realloc-errors: t-reftable-merged: handle realloc errors reftable: handle realloc error in parse_names() reftable: fix allocation count on realloc error reftable: avoid leaks on realloc error