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/mci/4ba631a853ce50f16755b234d8179d50/bazel_cache/9df6a3fc2ada258bfb34802feb09750c/execroot/_main/src/mongo/db/repl/dbcheck/dbcheck.cpp:1184: FORWARD_NULL 174178 Comparing "indexDescriptor" to null implies that "indexDescriptor" might be null.