pgsql-server: Add missing check for too-few-inputs when replacing a

Log Message:
-----------
Add missing check for too-few-inputs when replacing a zero-dimensional
array.

Tags:
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REL7_4_STABLE

Modified Files:
--------------
pgsql-server/src/backend/utils/adt:
arrayfuncs.c (r1.100 -> r1.100.2.1)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/src/backend/utils/adt/arrayfuncs.c.diff?r1=1.100&r2=1.100.2.1)