Fix null-dereference crash in parse_xml_decl().

parse_xml_decl's header comment says you can pass NULL for any unwanted
output parameter, but it failed to honor this contract for the "standalone"
flag.  The only currently-affected caller is xml_recv, so the net effect is
that sending a binary XML value containing a standalone parameter in its
xml declaration would crash the backend.  Per bug #6044 from Christopher
Dillard.

In passing, remove useless initializations of parse_xml_decl's output
parameters in xml_parse.

Back-patch to 8.3, where this code was introduced.

Branch
------
REL9_0_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/ab7c5a90828472c2261048a7195ab9218b55e296

Modified Files
--------------
src/backend/utils/adt/xml.c |   10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)

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	Subject: pgsql: Fix null-dereference crash in parse_xml_decl().