[Libvir] sexpr_get: add __printf__ attribute

[Jim Meyering]

I noticed sexpr_get takes a printf-style format,
yet it is declared with no printf attribute.  Here's the fix:

2007-10-17  Jim Meyering  <meyering at redhat.com>

	* src/xend_internal.c (sexpr_get): Declare with gcc's printf attribute.

Index: src/xend_internal.c
===================================================================
RCS file: /data/cvs/libvirt/src/xend_internal.c,v
retrieving revision 1.148
diff -u -p -r1.148 xend_internal.c
--- src/xend_internal.c	15 Oct 2007 21:38:56 -0000	1.148
+++ src/xend_internal.c	17 Oct 2007 08:29:26 -0000
@@ -692,6 +692,10 @@ xend_op(virConnectPtr xend, const char *
  */
 static struct sexpr *
 sexpr_get(virConnectPtr xend, const char *fmt, ...)
+  __attribute__ ((__format__ (__printf__, 2, 3)));
+
+static struct sexpr *
+sexpr_get(virConnectPtr xend, const char *fmt, ...)
 {
     char buffer[4096];
     char path[1024];