[COMMITTERS] pgsql: Suppress compiler warning, and not incidentally make the code

Log Message:
-----------
Suppress compiler warning, and not incidentally make the code more
robust. The previous coding was quite risky because it was testing
conditions different from 'is the array really allocated?'.

Modified Files:
--------------
pgsql/src/bin/psql:
describe.c (r1.183 -> r1.184)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/describe.c?r1=1.183&r2=1.184)

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