ntdll: send_debug_event: don't send uninitialized bytes

[Dan Kegel]

This patch is a slight optimization; it avoids sending
unused and uninitialized parts of the exception record
to the server.  (This is the other side of
http://winehq.org/pipermail/wine-devel/2007-November/060548.html
Both stand alone, they don't need to go together.
This one is done right.)

Found via Valgrind warning:
 Syscall param writev(vector[2]) points to uninitialised byte(s)
    at 0x40007F2: (within /lib/ld-2.5.so)
    by 0x44087F4: wine_server_call (server.c:244)
    by 0x43DFF48: send_debug_event (exception.c:207)
    by 0x43E01FE: raise_exception (exception.c:364)
    by 0x43E05A8: __regs_RtlRaiseException (exception.c:395)
    by 0x4409A3B: raise_segv_exception (signal_i386.c:1030)
    by 0xDEADBABD: ???
    by 0x676CAB2: DOSMEM_InitDosMemory (dosmem.c:172)
    by 0x676CF31: DllMain (dosvm.c:708)
when installing Word 97 Viewer, but probably comes up
in many places.
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