Typo in sheep(8) man page.

Signed-off-by: Paul Schulz <paul@mawsonlakes.org>
Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>
collie: use xmalloc() where it is suitable than raw malloc()

This patch replaces malloc() calls of collie with xmalloc() where fail
of memory allocation directly causes a fatal error.

Cc: Harry Wei <harryxiyou@gmail.com>
Signed-off-by: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp>
Signed-off-by: MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>