Re: [libvirt] [PATCH] util: make interface.c functions consistently return < 0 on error

(This patch must be pushed before the "listenNetwork" patches can be pushed) All of the functions in util/interface.c were returning 0 on success, but some returned -1 on error, and some returned a positive value (usually the value of errno, but sometimes just 1). Libvirt's standard is to return< 0 on error (in the case of functions that need to return errno, -errno is returned. This patch modifies all functions in interface.c to consistently return< 0 on error, and makes changes to callers of those functions where necessary.