Merge branch 'jk/size-t'

Code clean-up to use size_t/ssize_t when they are the right type. * jk/size-t: strbuf_humanise: use unsigned variables pass st.st_size as hint for strbuf_readlink() strbuf_readlink: use ssize_t strbuf: use size_t for length in intermediate variables reencode_string: use size_t for string lengths reencode_string: use st_add/st_mult helpers