Correct msgbuf_write() example. OK jmc@ and nicm@

src/lib/libutil/imsg_init.3

@@ -1,4 +1,4 @@
-.\" $OpenBSD: imsg_init.3,v 1.3 2010/10/31 17:33:33 nicm Exp $
+.\" $OpenBSD: imsg_init.3,v 1.4 2011/03/05 15:05:39 claudio 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: October 31 2010 $
+.Dd $Mdocdate: March 5 2011 $
 .Dt IMSG_INIT 3
 .Os
 .Sh NAME
@@ -492,7 +492,7 @@ library is used to monitor the socket file descriptor.
 When the socket is ready for writing, queued messages are transmitted with
 .Fn msgbuf_write :
 .Bd -literal -offset indent
-	if (msgbuf_write(ibuf-\*(Gtw) \*(Lt 0) {
+	if (msgbuf_write(&ibuf-\*(Gtw) \*(Lt 0) {
 		/* handle write failure */
 	}
 .Ed