xenocara/dist/xcb-util/icccm: fix reply->format check

Hi all,

The attached patch fixes a bug in libxcb-icccm that affects xcb-based WMs.

For example, with i3 window manager from ports/x11/i3, launching xev makes 
i3 crash: 

GNU gdb 6.3
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This GDB was configured as "i386-unknown-openbsd4.7"...
Core was generated by `i3'.
Program terminated with signal 8, Arithmetic exception.

...

#0  0x0a2f493a in xcb_get_wm_hints_from_reply (hints=0xcfbf9870, 
    reply=0x85607bc0) at /usr/xenocara/dist/xcb-util/icccm/icccm.c:639
639	  num_elem = length / (reply->format / 8);
(gdb) quit


Patch is from fdo's git repo:
http://cgit.freedesktop.org/xcb/util/commit/?id=d5b5d682465bd3196105df86d6df9fcde9518e6c

Cheers,
David


Index: icccm.c
===================================================================
RCS file: /cvs/xenocara/dist/xcb-util/icccm/icccm.c,v
retrieving revision 1.4
diff -N -u -p icccm.c
--- icccm.c	5 Sep 2009 15:55:46 -0000	1.4
+++ icccm.c	5 Mar 2010 11:46:59 -0000
@@ -632,15 +632,13 @@ xcb_get_wm_hints_from_reply(xcb_wm_hints_t *hints,
 {
   int length, num_elem;
 
-  if(!reply)
+  if(!reply || reply->type != WM_HINTS || reply->format != 32)
     return 0;
 
   length = xcb_get_property_value_length(reply);
   num_elem = length / (reply->format / 8);
 
-  if (reply->type != WM_HINTS
-      || reply->format != 32
-      || num_elem < XCB_NUM_WM_HINTS_ELEMENTS - 1)
+  if(num_elem < XCB_NUM_WM_HINTS_ELEMENTS - 1)
     return 0;
 
   memcpy(hints, (xcb_size_hints_t *) xcb_get_property_value(reply), length);