Modify example not to use an assignment in the if statement. We shouldn't

teach people bad habits!
ok krw@, jmc@, dlg@, thib@

src/lib/libc/string/strdup.3

@@ -1,4 +1,4 @@
-.\" $OpenBSD: strdup.3,v 1.14 2007/05/31 19:19:32 jmc Exp $
+.\" $OpenBSD: strdup.3,v 1.15 2010/03/24 14:47:46 kettenis Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)strdup.3	8.1 (Berkeley) 6/9/93
 .\"
-.Dd $Mdocdate: May 31 2007 $
+.Dd $Mdocdate: March 24 2010 $
 .Dt STRDUP 3
 .Os
 .Sh NAME
@@ -59,7 +59,8 @@ to an allocated area of memory containing the NUL-terminated string
 .Bd -literal -offset indent
 char *p;
 
-if ((p = strdup("foobar")) == NULL) {
+p = strdup("foobar");
+if (p == NULL) {
 	fprintf(stderr, "Out of memory.\en");
 	exit(1);
 }