[evolution] Do not leak memory on each mail folder change

[Milan Crha <mcrha src gnome org>]

commit 8c351c101f765906b72e08fe1caa833d994bff31
Author: Milan Crha <mcrha redhat com>
Date:   Mon Aug 1 15:09:10 2011 +0200

    Do not leak memory on each mail folder change

 modules/mail/e-mail-shell-view-private.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/modules/mail/e-mail-shell-view-private.c b/modules/mail/e-mail-shell-view-private.c
index ee1c55e..7299444 100644
--- a/modules/mail/e-mail-shell-view-private.c
+++ b/modules/mail/e-mail-shell-view-private.c
@@ -115,6 +115,7 @@ mail_shell_view_folder_tree_selected_cb (EMailShellView *mail_shell_view,
 	/* Cancel any unfinished open folder operations. */
 	if (mail_shell_view->priv->opening_folder != NULL) {
 		g_cancellable_cancel (mail_shell_view->priv->opening_folder);
+		g_object_unref (mail_shell_view->priv->opening_folder);
 		mail_shell_view->priv->opening_folder = NULL;
 	}