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[libvirt] [PATCH] Fix link_addr detection



link_addr detection in configure always reports that
link_addr is missing because it uses link_addr(NULL, NULL) in
AC_LINK_IFELSE check with limited set of headers that doesn't
define NULL.

Fix by replacing 'NULL' with just '0'.
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 27531a1..cc9942a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2401,7 +2401,7 @@ AC_LINK_IFELSE([AC_LANG_PROGRAM(
         #include <net/if_dl.h>
      ]],
      [[
-        link_addr(NULL, NULL)]])],
+        link_addr(0, 0)]])],
      [AC_DEFINE([HAVE_DECL_LINK_ADDR],
                 [1],
                 [whether link_addr is available])])
-- 
1.7.11.5


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