[balsa] pop3: Do not leak the filter-cmd

[Peter Bloomfield <peterb src gnome org>]

commit 376b622de322d42dd3e347ab22228d90820bfca5
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Thu Feb 14 15:49:45 2019 -0500

    pop3: Do not leak the filter-cmd

 libbalsa/mailbox_pop3.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/libbalsa/mailbox_pop3.c b/libbalsa/mailbox_pop3.c
index e8561e3c0..dd6adae69 100644
--- a/libbalsa/mailbox_pop3.c
+++ b/libbalsa/mailbox_pop3.c
@@ -135,8 +135,10 @@ static void
 libbalsa_mailbox_pop3_finalize(GObject * object)
 {
     LibBalsaMailboxRemote *remote = LIBBALSA_MAILBOX_REMOTE(object);
+    LibBalsaMailboxPop3 *mailbox = LIBBALSA_MAILBOX_POP3(object);
 
     g_object_unref(G_OBJECT(remote->server));
+    g_free(mailbox->filter_cmd);
 
     if (G_OBJECT_CLASS(parent_class)->finalize)
        G_OBJECT_CLASS(parent_class)->finalize(object);
@@ -750,6 +752,7 @@ libbalsa_mailbox_pop3_load_config(LibBalsaMailbox * mailbox,
     pop->disable_apop = libbalsa_conf_get_bool("DisableApop=false");
     pop->enable_pipe = libbalsa_conf_get_bool("EnablePipe=false");
     pop->filter = libbalsa_conf_get_bool("Filter=false");
+    g_free(pop->filter_cmd);
     pop->filter_cmd = libbalsa_conf_get_string("FilterCmd");
     if(pop->filter_cmd && *pop->filter_cmd == '\0') {
        g_free(pop->filter_cmd); pop->filter_cmd = NULL;