The attached patch adds a central errno.h to libsepol and converts 
several existing error numbers. This will unify the error numbers, 
remove duplication, and prevent overlapping error numbers (a source of 
potential bugs). Existing return values from functions exposed as part 
of the binary interface are not changed.

Signed-off-by: Karl MacMillan <kmacmillan@mentalrootkit.com>

  checkpolicy/policy_parse.y                    |   15 ++---
  libsepol/include/sepol/errno.h                |   38 +++++++++++++
  libsepol/include/sepol/policydb/hashtab.h     |   43 ++++++++++-----
  libsepol/include/sepol/policydb/link.h        |   11 +--
  libsepol/src/avtab.c                          |   18 +++---
  libsepol/src/expand.c                         |    7 +-
  libsepol/src/hashtab.c                        |   45 +++++++++++-----
  libsepol/src/link.c                           |   33 ++++++-----
  libsepol/src/policydb.c                       |    6 +-
  libsepol/src/private.h                        |    4 +
  policycoreutils/semodule_deps/semodule_deps.c |    9 +--
  11 files changed, 156 insertions(+), 73 deletions(-)