[libadwaita] button-content: Fix setting icon name

[Alexander Mikhaylenko <alexm src gnome org>]

commit e2dd9a2c9fbe963ef245c255cb3c73d74610334e
Author: Mohammed Sadiq <sadiq sadiqpk org>
Date:   Thu Sep 23 10:39:54 2021 +0530

    button-content: Fix setting icon name

 src/adw-button-content.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/adw-button-content.c b/src/adw-button-content.c
index c73e102e..23c2f2d3 100644
--- a/src/adw-button-content.c
+++ b/src/adw-button-content.c
@@ -335,7 +335,7 @@ adw_button_content_set_icon_name (AdwButtonContent *self,
     return;
 
   g_free (self->icon_name);
-  icon_name = g_strdup (icon_name);
+  self->icon_name = g_strdup (icon_name);
 
   if (!icon_name[0])
     icon_name = "image-missing";