Simplify GetOperatorFromCompareType() code

The old code would set *opid = InvalidOid to determine if the
get_opclass_opfamily_and_input_type() worked or not.  This means more
moving parts that what's really needed here.  Let's just fail
immediately if the get_opclass_opfamily_and_input_type() lookup fails.

Author: Paul A Jungwirth <[email protected]>
Reviewed-by: Neil Chen <[email protected]>
Discussion: 
https://postgr.es/m/ca+renyxorjlacp_nhqequf2w+zcoy2q5kpqcfg05vqvyzr8...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/7f9acc9bccfe2dc4d7d8ba75057c91ef09a7ebf2

Modified Files
--------------
src/backend/commands/indexcmds.c | 52 +++++++++++++++++++++-------------------
1 file changed, 27 insertions(+), 25 deletions(-)

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