small error in xfwm4

[Oliver Lehmann]

Hi,

I really hope I don't need to fill a bug report for this small error
which is 100% obvious and really easy to fix.

http://svn.xfce.org/svn/xfce/xfwm4/trunk/src/mywindow.c

function "xfwmWindowInit" assigns NULL to win->pict_format but xfwmWindow
has no element "pict_format" in case RENDER was not found so this should
be changed (like all the other pict_format usages later in code) to:

#ifdef HAVE_RENDER
    win->pict_format = NULL;
#endif

-- 
 Oliver Lehmann
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