Dereference after null check

Either the check against null is unnecessary, or there may be a null pointer dereference. Pointer is checked against null but then dereferenced anyway
/data/bazel_cache/1de52aaeb35278243ca29a4785ce7969/execroot/_main/src/mongo/db/exec/sbe/stages/hash_agg.h:138: FORWARD_NULL 172710 Calling "this->_recordStore.operator bool()" implies that "this->_recordStore" might be null-like.
/data/bazel_cache/1de52aaeb35278243ca29a4785ce7969/execroot/_main/src/mongo/db/exec/sbe/stages/hash_agg.h:150: FORWARD_NULL 172710 Although "spill" does overwrite "this->_recordStore" on some paths, it also contains at least one feasible path which does not overwrite it.