Dereference before null check

There may be a null pointer dereference, or else the comparison against null is unnecessary. All paths that lead to this null pointer comparison already dereference the pointer earlier
/src/mongo/db/query/sbe_runtime_planner.cpp:123: REVERSE_INULL 121112 Null-checking "candidate" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.