[gtk-vnc] Restore correct size of reserved data

[Daniel P. Berrange <dberrange src gnome org>]

commit 77bd7cd620a1f9d45f9d479b55a5cba807732b91
Author: Daniel P. Berrange <berrange redhat com>
Date:   Thu Apr 6 17:12:24 2017 +0100

    Restore correct size of reserved data
    
    A previous commit
    
      commit 7a9271620c894931cc22d6587d58e46c5996dac3
      Author: Lei Li <lilei linux vnet ibm com>
      Date:   Mon May 20 11:45:59 2013 +0100
    
        Add support for LED state extension to gvnc
    
    removed 4 elements from the reserved data field, when adding
    one pointer. This is because it mistakenly thought the reserved
    elements were 1 byte in length, when they are in fact one pointer
    in size.
    
    The original change was technically an ABI incompatible change,
    as is this fix. In practice, however, GObject classes are never
    instantiated statically at compile time. Instead a call to
    g_type_register_static is made at runtime. So this change in the
    class size won't have a negative effect unless someone has
    subclassed the VncConnectionClass type. Even if subclassing, this
    should be harmless as we've merely increased the memory allocation
    by 3 words.
    
    Signed-off-by: Daniel P. Berrange <berrange redhat com>

 src/vncconnection.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/vncconnection.h b/src/vncconnection.h
index 8c1fa28..3477d1b 100644
--- a/src/vncconnection.h
+++ b/src/vncconnection.h
@@ -85,7 +85,7 @@ struct _VncConnectionClass
      * If adding fields to this struct, remove corresponding
      * amount of padding to avoid changing overall struct size
      */
-    gpointer _vnc_reserved[VNC_PADDING_LARGE - 5];
+    gpointer _vnc_reserved[VNC_PADDING_LARGE - 2];
 };