Fix valgrind issue in commit
05c8482f7f.
Initialize other newly added variables in max_parallel_hazard_context via
is_parallel_safe() because we don't check the parallel-safety of target
relations in that function.
Reported-by: Tom Lane as per buildfarm
Author: Amit Kapila
Discussion: https://postgr.es/m/
2060179.
1615347455@sss.pgh.pa.us