[devhelp] Take advantage of g_file_peek_path()

[Sébastien Wilmet <swilmet src gnome org>]

commit b83fa74824bfbe0573e997eac65ee590bd88d6e7
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Apr 1 13:30:00 2018 +0200

    Take advantage of g_file_peek_path()

 README                 |    2 +-
 meson.build            |    2 +-
 unit-tests/test-util.c |    5 ++---
 3 files changed, 4 insertions(+), 5 deletions(-)
---
diff --git a/README b/README
index 3975d5e..839d209 100644
--- a/README
+++ b/README
@@ -8,7 +8,7 @@ The Devhelp web page:
 Dependencies
 ------------
 
-- glib >= 2.40
+- glib >= 2.56
 - gtk+ >= 3.22
 - webkit2gtk-4.0 >= 2.19.2
 - gsettings-desktop-schemas
diff --git a/meson.build b/meson.build
index 1eaf23e..2901a2f 100644
--- a/meson.build
+++ b/meson.build
@@ -32,7 +32,7 @@ lt_age=0
 LIBDEVHELP_LT_VERSION='@0@.@1@.@2@'.format(lt_current, lt_revision, lt_age)
 
 libdevhelp_deps_array = [
-        ['gio-2.0', '>= 2.40'],
+        ['gio-2.0', '>= 2.56'],
         ['gtk+-3.0', '>= 3.22'],
         ['webkit2gtk-4.0', '>= 2.19.2']
 ]
diff --git a/unit-tests/test-util.c b/unit-tests/test-util.c
index ce13558..ffe6721 100644
--- a/unit-tests/test-util.c
+++ b/unit-tests/test-util.c
@@ -39,7 +39,7 @@ check_get_possible_index_files (const gchar *book_directory_path,
                 gchar *expected_basename;
                 gchar *basename;
                 gchar *expected_path;
-                gchar *path;
+                const gchar *path;
 
                 switch (i) {
                         case 0:
@@ -66,13 +66,12 @@ check_get_possible_index_files (const gchar *book_directory_path,
                 g_assert_cmpstr (basename, ==, expected_basename);
 
                 expected_path = g_build_filename (book_directory_path, expected_basename, NULL);
-                path = g_file_get_path (index_file);
+                path = g_file_peek_path (index_file);
                 g_assert_cmpstr (path, ==, expected_path);
 
                 g_free (expected_basename);
                 g_free (basename);
                 g_free (expected_path);
-                g_free (path);
         }
 
         g_object_unref (book_directory);