Merge branch 'tg/memfixes'

Fixes for a handful memory access issues identified by valgrind.

* tg/memfixes:
sub-process: use child_process.args instead of child_process.argv
http-push: fix construction of hex value from path
path.c: fix uninitialized memory access

diff --cc http-push.c
Simple merge

diff --cc path.c
Simple merge

diff --cc sub-process.c
Simple merge