[hacktree] Don't use g_variant_new_from_fixed_array(), it was only added in 2.31

[Colin Walters <walters src gnome org>]

commit b7d45436a01ef1b7ad99ab56a511ac2a93d31283
Author: Colin Walters <walters verbum org>
Date:   Thu Oct 20 10:20:51 2011 -0400

    Don't use g_variant_new_from_fixed_array(), it was only added in 2.31
    
    g_variant_new_from_data() works, and actually allows us to avoid
    a memdup()/free().

 configure.ac                |    2 +-
 src/libostree/ostree-core.c |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 43f18cc..f817b19 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,7 +30,7 @@ LT_INIT
 
 PKG_PROG_PKG_CONFIG
 
-PKG_CHECK_MODULES(GIO_UNIX, [gio-unix-2.0])
+PKG_CHECK_MODULES(GIO_UNIX, [gio-unix-2.0 >= 2.30])
 
 AM_PATH_PYTHON
 
diff --git a/src/libostree/ostree-core.c b/src/libostree/ostree-core.c
index fb6ad1b..fa13909 100644
--- a/src/libostree/ostree-core.c
+++ b/src/libostree/ostree-core.c
@@ -96,9 +96,9 @@ read_xattr_name_array (const char *path,
       
       g_variant_builder_add (builder, "(@ay ay)",
                              g_variant_new_bytestring (p),
-                             g_variant_new_fixed_array (G_VARIANT_TYPE ("y"), buf, bytes_read, 1));
+                             g_variant_new_from_data (G_VARIANT_TYPE ("ay"),
+                                                      buf, bytes_read, FALSE, g_free, buf));
 
-      g_free (buf);
       p = p + strlen (p) + 1;
     }