fixup! Add support to new atom chunk format introduced with OTP-28

Author: bettio

src/libAtomVM/atom_table.c

@@ -542,6 +542,11 @@ int atom_table_ensure_atoms(struct AtomTable *table, const void *atoms, int coun
 
             if (is_long_format) {
                 uint8_t *atom_copy = malloc(atom_len + 1);
+                if (IS_NULL_PTR(atom_copy)) {
+                    // we are not going to remove atoms that have already been added up to this one
+                    SMP_UNLOCK(table);
+                    return ATOM_TABLE_ALLOC_FAIL;
+                }
                 atom_copy[0] = atom_len;
                 memcpy(atom_copy + 1, to_be_copied, atom_len);
                 current_atom = atom_copy;