pgsql: Use class_args field in opclass_drop

Use class_args field in opclass_drop

This makes it consistent with the usage in opclass_item.

Reviewed-by: Jim Nasby <Jim.Nasby@BlueTreble.com>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/63ebd377a6ecd3388596c3ea958e813f23b5f4ae

Modified Files
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src/backend/commands/opclasscmds.c | 4 ++--
src/backend/parser/gram.y | 4 ++--
src/include/nodes/parsenodes.h | 3 ++-
3 files changed, 6 insertions(+), 5 deletions(-)

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