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/btree/row_modify.c:355: REVERSE_INULL 135089 Directly dereferencing pointer "page->modify".
/src/btree/row_modify.c:437: REVERSE_INULL 135089 Null-checking "page->modify" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.