MFC r219722 (by jhb):

MFC r219722 (by jhb):
  Preserve errno in an error case.
  Submitted by:	gcooper

MFC r222899:
  Contrary to when returning in all-good cases at the end of functions we
  did not free memory (1) or close the file descriptor (2) in error cases.

  Reported by:	Mark Johnston (1)
  Reported by:	attilio (2)
  Reviewed by:	jhb
Sponsored by:	Sandvine Incorporated

git-svn-id: svn://svn.freebsd.org/base/stable/8@223274 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f