Silence "may be used uninitialized" compiler warning.

Newer gcc warns that this "actual_arg_types" variable may be used
uninitialized, but visual inspection indicates there's no bug.  To
silence the warning, initialize the variable to zeros.

Bug: #19485
Reported-by: Hans Buschmann <[email protected]>
Tested-by: Erik Rijkers <[email protected]>
Tested-by: Hans Buschmann <[email protected]>
Reviewed-by: Tristan Partin <[email protected]>
Reviewed-by: Álvaro Herrera <[email protected]>
Discussion: https://postgr.es/m/19485-2b03231a775756f1%40postgresql.org
Discussion: https://postgr.es/m/6c52a1a6612948519468d46cb224a8c4%40nidsa.net

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/f04781df5daf112840d08eab39fb95505fda6c9c

Modified Files
--------------
src/backend/optimizer/util/clauses.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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