[gtk+] boxgadget: Don't use g_assert

[Timm Bäder <baedert src gnome org>]

commit 4703d2bbf036e97a9500bcac02180b4e97df2273
Author: Timm Bäder <mail baedert org>
Date:   Wed Jan 13 19:24:46 2016 +0100

    boxgadget: Don't use g_assert
    
    Use g_return_if_fail instead so nothing abort()s.

 gtk/gtkboxgadget.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkboxgadget.c b/gtk/gtkboxgadget.c
index 8aff3f0..15fe036 100644
--- a/gtk/gtkboxgadget.c
+++ b/gtk/gtkboxgadget.c
@@ -111,7 +111,7 @@ gtk_box_gadget_distribute (GtkBoxGadget     *gadget,
       size -= sizes[i].minimum_size;
     }
 
-  g_assert (size >= 0);
+  g_return_if_fail (size >= 0);
 
   size = gtk_distribute_natural_allocation (size, priv->children->len, sizes);