Add missing free on cc_entries

Looks like an oversight in b9007b6c54 and
7ec2359374.

mjit_worker.c

@@ -427,6 +427,9 @@ free_unit(struct rb_mjit_unit *unit)
         unit->iseq->body->jit_func = (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC;
         unit->iseq->body->jit_unit = NULL;
     }
+    if (unit->cc_entries) {
+        free(unit->cc_entries);
+    }
     if (unit->handle && dlclose(unit->handle)) { // handle is NULL if it's in queue
         mjit_warning("failed to close handle for u%d: %s", unit->id, dlerror());
     }