pgsql: postgres_fdw and dblink should check if backend has MyProcPort

pgsql: postgres_fdw and dblink should check if backend has MyProcPort

postgres_fdw and dblink should check if backend has MyProcPort

before checking ->has_scram_keys.  MyProcPort is NULL in background
workers.  So this could crash for example if a background worker
accessed a suitable configured foreign table.

Author: Alexander Pyhalov 
Reviewed-by: Peter Eisentraut 
Reviewed-by: Matheus Alcantara 
Discussion: https://www.postgresql.org/message-id/flat/27b29a35-9b96-46a9-bc1a-914140869dac%40gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/138750dde4a8b939a30a6d650c6c8146192b39cb

Modified Files
--------------
contrib/dblink/dblink.c           | 8 ++++----
contrib/postgres_fdw/connection.c | 8 ++++----
2 files changed, 8 insertions(+), 8 deletions(-)