pgsql: Fix netmask handling in inet_minmax_multi_ops

Fix netmask handling in inet_minmax_multi_ops

When calculating distance in brin_minmax_multi_distance_inet(), the
netmask was applied incorrectly. This results in (seemingly) incorrect
ordering of values, triggering an assert.

For builds without asserts this is mostly harmless - we may merge other
ranges, possibly resulting in slightly less efficient index. But it's
still correct and the greedy algorithm doesn't guarantee optimality
anyway.

Backpatch to 14, where minmax-multi indexes were introduced.

Reported by Dmitry Dolgov, investigation and fix by me.

Reported-by: Dmitry Dolgov
Backpatch-through: 14
Discussion: https://postgr.es/m/17774-c6f3e36dd4471e67@postgresql.org

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/e8583126833a53f4eebe28a8de45d128f01ff664

Modified Files
--------------
src/backend/access/brin/brin_minmax_multi.c | 4 ++--
src/test/regress/expected/brin_multi.out    | 6 ++++++
src/test/regress/sql/brin_multi.sql         | 7 +++++++
3 files changed, 15 insertions(+), 2 deletions(-)