[evolution-data-server] Revert leak-fix part from commit eb8ba5489

[Milan Crha <mcrha src gnome org>]

commit f84fcc24a4e2ae18e51d8090d342a108e0a7e66f
Author: Milan Crha <mcrha redhat com>
Date:   Wed Jun 18 09:01:40 2014 +0200

    Revert leak-fix part from commit eb8ba5489
    
    I thought it leaks there, but the 'mailbox' variable is freed elsewhere,
    thus the added code caused a double-free.

 camel/providers/imapx/camel-imapx-server.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/camel/providers/imapx/camel-imapx-server.c b/camel/providers/imapx/camel-imapx-server.c
index df09eff..8138258 100644
--- a/camel/providers/imapx/camel-imapx-server.c
+++ b/camel/providers/imapx/camel-imapx-server.c
@@ -3730,7 +3730,6 @@ imapx_call_idle (gpointer data)
        g_clear_object (&cancellable);
 
 exit:
-       g_clear_object (&mailbox);
        g_clear_object (&is);
 
        return G_SOURCE_REMOVE;