[glib] gerror: Mention that g_clear_error can be used with an "empty" GError

[Debarshi Ray <debarshir src gnome org>]

commit 4569161f81e9338bb91e5a64fd1d00665bcb19e6
Author: Stephan Hesse <stephan soundcloud com>
Date:   Tue Sep 29 17:50:39 2015 +0200

    gerror: Mention that g_clear_error can be used with an "empty" GError
    
    It is fine to do:
    GError *error = NULL;
    g_clear_error (&error);
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762937

 glib/gerror.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/glib/gerror.c b/glib/gerror.c
index 7c72d2b..380382b 100644
--- a/glib/gerror.c
+++ b/glib/gerror.c
@@ -663,7 +663,7 @@ g_propagate_error (GError **dest,
  * g_clear_error:
  * @err: a #GError return location
  *
- * If @err is %NULL, does nothing. If @err is non-%NULL,
+ * If @err or * err is %NULL, does nothing. Otherwise,
  * calls g_error_free() on * err and sets * err to %NULL.
  */
 void