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 Eisentrau

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 Eisentrau