[PATCH] canonicalize: Fix broken probe for realpath.

[Eric Blake]

Noticed in libvirt due to rpl_canonicalize being compiled on
glibc where it used to rely on the libc version.

* m4/canonicalize.m4 (gl_FUNC_REALPATH_WORKS): Fix regression
in logic introduced in 54615b95.

Signed-off-by: Eric Blake <address@hidden>
---
 ChangeLog          | 6 ++++++
 m4/canonicalize.m4 | 4 ++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 6e3bb11..2d5a548 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-05-27  Eric Blake  <address@hidden>
+
+       canonicalize: Fix broken probe for realpath.
+       * m4/canonicalize.m4 (gl_FUNC_REALPATH_WORKS): Fix regression
+       in logic introduced in 54615b95.
+
 2016-05-26  Eric Blake  <address@hidden>

        unsetenv: relax to LGPLv2+
diff --git a/m4/canonicalize.m4 b/m4/canonicalize.m4
index bfc9ebe..cbbf3e2 100644
--- a/m4/canonicalize.m4
+++ b/m4/canonicalize.m4
@@ -1,4 +1,4 @@
-# canonicalize.m4 serial 27
+# canonicalize.m4 serial 28

 dnl Copyright (C) 2003-2007, 2009-2016 Free Software Foundation, Inc.

@@ -100,7 +100,7 @@ AC_DEFUN([gl_FUNC_REALPATH_WORKS],
         {
           char *name1 = realpath (".", NULL);
           char *name2 = realpath ("conftest.d//./..", NULL);
-          if (! (name1 && name2 && strcmp (name1, name2) != 0))
+          if (! name1 || ! name2 || strcmp (name1, name2))
             result |= 8;
           free (name1);
           free (name2);
-- 
2.5.5