[balsa] mailbox: Ensure gboolean return value

[Peter Bloomfield <peterb src gnome org>]

commit 266cf2c433c2daa8201be0ab7dd3cb55f4eb2f8b
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Sun Jan 12 17:53:55 2020 -0500

    mailbox: Ensure gboolean return value
    
    Ensure that a function declared as returning gboolean returns only
    either TRUE or FALSE.

 libbalsa/mailbox.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/libbalsa/mailbox.c b/libbalsa/mailbox.c
index ed3e0f250..7efaba595 100644
--- a/libbalsa/mailbox.c
+++ b/libbalsa/mailbox.c
@@ -4803,7 +4803,7 @@ libbalsa_mailbox_get_msg_tree_changed(LibBalsaMailbox * mailbox)
 
     g_return_val_if_fail(LIBBALSA_IS_MAILBOX(mailbox), FALSE);
 
-    return priv->msg_tree_changed;
+    return priv->msg_tree_changed != 0;
 }
 
 LibBalsaMailboxState
@@ -4863,7 +4863,7 @@ libbalsa_mailbox_get_readonly(LibBalsaMailbox * mailbox)
 
     g_return_val_if_fail(LIBBALSA_IS_MAILBOX(mailbox), FALSE);
 
-    return priv->readonly;
+    return priv->readonly != 0;
 }
 
 const gchar *
@@ -4883,7 +4883,7 @@ libbalsa_mailbox_get_has_unread_messages(LibBalsaMailbox * mailbox)
 
     g_return_val_if_fail(LIBBALSA_IS_MAILBOX(mailbox), FALSE);
 
-    return priv->has_unread_messages;
+    return priv->has_unread_messages != 0;
 }
 
 gboolean
@@ -4893,7 +4893,7 @@ libbalsa_mailbox_get_messages_loaded(LibBalsaMailbox * mailbox)
 
     g_return_val_if_fail(LIBBALSA_IS_MAILBOX(mailbox), FALSE);
 
-    return priv->messages_loaded;
+    return priv->messages_loaded != 0;
 }
 
 gboolean
@@ -4903,7 +4903,7 @@ libbalsa_mailbox_get_messages_threaded(LibBalsaMailbox * mailbox)
 
     g_return_val_if_fail(LIBBALSA_IS_MAILBOX(mailbox), FALSE);
 
-    return priv->messages_threaded;
+    return priv->messages_threaded != 0;
 }
 
 /*