pgsql: Check that result tupdesc has exactly 1 column in return_next sc

Check that result tupdesc has exactly 1 column in return_next scalar case.

This should always be true, but since we're relying on a tuple descriptor
passed from outside pltcl itself, let's check. Per a gripe from Coverity.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/4ecd1974377ffb4d6d72874ba14fcd23965b1792

Modified Files
--------------
src/pl/tcl/pltcl.c | 4 ++++
1 file changed, 4 insertions(+)

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