[sheepdog] [sheepdog/sheepdog] 5ebf14: lib, sheep: remove obsolete valloc() calls

[Hitoshi Mitake]

  Branch: refs/heads/valloc
  Home:   https://github.com/sheepdog/sheepdog
  Commit: 5ebf14b85ce96881aca90dc236d5f06e5b5c075b
      https://github.com/sheepdog/sheepdog/commit/5ebf14b85ce96881aca90dc236d5f06e5b5c075b
  Author: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
  Date:   2018-01-16 (Tue, 16 Jan 2018)

  Changed paths:
    M lib/util.c
    M sheep/gateway.c
    M sheep/request.c
    M sheep/store/plain_store.c
    M sheep/store/tree_store.c

  Log Message:
  -----------
  lib, sheep: remove obsolete valloc() calls

We should use posix_memalign() instead of valloc().

Signed-off-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>