pgsql: Defend against bad trigger definitions in contrib/lo's lo_manage

Defend against bad trigger definitions in contrib/lo's lo_manage() trigger.

This function formerly crashed if called as a statement-level trigger,
or if a column-name argument wasn't given.

In passing, add the trigger name to all error messages from the function.
(None of them are expected cases, so this shouldn't pose any compatibility
risk.)

Marc Cousin, reviewed by Sawada Masahiko

Branch
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REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/8bf45ea8ba1d04e3df20a288e58c5f45fc54d1e6

Modified Files
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contrib/lo/lo.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

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