update return values for ibuf_write and msgbuf_write

ok gilles@

src/lib/libutil/imsg_init.3

@@ -1,4 +1,4 @@
-.\" $OpenBSD: imsg_init.3,v 1.5 2011/06/23 22:07:14 sthen Exp $
+.\" $OpenBSD: imsg_init.3,v 1.6 2012/06/15 23:44:43 jmatthew Exp $
 .\"
 .\" Copyright (c) 2010 Nicholas Marriott <nicm@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 .\" OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: June 23 2011 $
+.Dd $Mdocdate: June 15 2012 $
 .Dt IMSG_INIT 3
 .Os
 .Sh NAME
@@ -393,7 +393,7 @@ routine transmits as many pending buffers as possible from
 .Fn msgbuf
 using
 .Xr writev 2 .
-It returns 0 if it succeeds, \-1 on error and \-2 when an EOF condition on the
+It returns 1 if it succeeds, \-1 on error and 0 when an EOF condition on the
 socket is detected.
 .Pp
 .Fn ibuf_free
@@ -421,7 +421,7 @@ routine calls
 .Xr sendmsg 2
 to transmit buffers queued in
 .Fa msgbuf .
-It returns 0 if it succeeds, \-1 on error, or \-2 when an EOF condition on the
+It returns 1 if it succeeds, \-1 on error, and 0 when an EOF condition on the
 socket is detected.
 .Pp
 .Fn msgbuf_drain