[gtksourceview] ContextEngine: use g_clear_error()

[Sébastien Wilmet <swilmet src gnome org>]

commit c944c07f80cfc03cddf17cd82624636d59e25b70
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Mon Jun 13 11:46:45 2016 +0200

    ContextEngine: use g_clear_error()

 gtksourceview/gtksourcecontextengine.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gtksourceview/gtksourcecontextengine.c b/gtksourceview/gtksourcecontextengine.c
index 614aab1..d7dc4e9 100644
--- a/gtksourceview/gtksourcecontextengine.c
+++ b/gtksourceview/gtksourcecontextengine.c
@@ -3141,7 +3141,7 @@ create_reg_all (Context           *context,
                g_warning (_("Cannot create a regex for all the transitions, "
                             "the syntax highlighting process will be slower "
                             "than usual.\nThe error was: %s"), error->message);
-               g_error_free (error);
+               g_clear_error (&error);
        }
 
        g_string_free (all, TRUE);
@@ -6312,7 +6312,7 @@ out:
        if (error)
        {
                g_warning ("%s", error->message);
-               g_error_free (error);
+               g_clear_error (&error);
        }
 }
 
@@ -6374,7 +6374,7 @@ out:
        if (error)
        {
                g_warning ("%s", error->message);
-               g_error_free (error);
+               g_clear_error (&error);
        }
 
        g_free (pattern);