pgsql: In array_position()/array_positions(), beware of empty input arr

In array_position()/array_positions(), beware of empty input array.

These functions incautiously fetched the array's first lower bound
even when the array is zero-dimensional, thus fetching the word
after the allocated array space.  While almost always harmless,
with very bad luck this could result in SIGSEGV.  Fix by adding
an early exit for empty input.

Per bug #17920 from Alexander Lakhin.

Discussion: https://postgr.es/m/17920-f7c228c627b6d02e%40postgresql.org

Branch
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REL_15_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/ccb479e76ac3032ef942f5d4f6a3ab742c2db03e

Modified Files
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src/backend/utils/adt/array_userfuncs.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)