veil - veil: Ensure no crashes will null parameter to deserialise.

Log Message:
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Ensure no crashes will null parameter to deserialise. It seems that from
plpgsql even with the function defined strict, a call with null is possible.

Modified Files:
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veil/src:
veil_interface.c (r1.10 -> r1.11)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/veil/veil/src/veil_interface.c.diff?r1=1.10&r2=1.11)