[gtk] passwordentry: Normalize boolean value

[Timm Bäder <baedert src gnome org>]

commit 0d95c5dfe283aad55a8475aedc7eb126b35597b5
Author: Timm Bäder <mail baedert org>
Date:   Wed Jul 24 08:10:37 2019 +0200

    passwordentry: Normalize boolean value

 gtk/gtkpasswordentry.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gtk/gtkpasswordentry.c b/gtk/gtkpasswordentry.c
index 2c6c3553ac..8515ba2b5c 100644
--- a/gtk/gtkpasswordentry.c
+++ b/gtk/gtkpasswordentry.c
@@ -470,6 +470,8 @@ gtk_password_entry_set_show_peek_icon (GtkPasswordEntry *entry,
 
   g_return_if_fail (GTK_IS_PASSWORD_ENTRY (entry));
 
+  show_peek_icon = !!show_peek_icon;
+
   if (show_peek_icon == (priv->peek_icon != NULL))
     return;