[gimp] plug-ins: fix a type warning.

[Jehan <jehanp src gnome org>]

commit 142002446e23c898069df66ce5c919ee5d48659e
Author: Jehan <jehan girinstud io>
Date:   Sat Sep 21 18:32:09 2019 +0200

    plug-ins: fix a type warning.
    
    When cross-compiling for Windows, I had this warning:
    > plug-ins/file-ico/ico-load.c:221:22: warning: format '%lu' expects
    > argument of type 'long unsigned int', but argument 5 has type 'long
    > long unsigned int' [-Wformat=]
    
    I guess that on some platform sizeof may be a long long uint. Just cast
    the result to long uint instead (I could have done the other way around,
    but I doubt the struct type IcoFileEntry would ever get bigger than long
    uint max!).

 plug-ins/file-ico/ico-load.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/plug-ins/file-ico/ico-load.c b/plug-ins/file-ico/ico-load.c
index a12ac60138..4695d8fdef 100644
--- a/plug-ins/file-ico/ico-load.c
+++ b/plug-ins/file-ico/ico-load.c
@@ -219,7 +219,7 @@ ico_read_info (FILE    *fp,
     {
       g_set_error (error, G_FILE_ERROR, 0,
                    _("Could not read '%lu' bytes"),
-                   sizeof (IcoFileEntry));
+                   (long unsigned int) sizeof (IcoFileEntry));
       g_free (entries);
       return NULL;
     }