tasking: don't forget to free the cwd on a dead process

src/tasking/task.c

@@ -132,6 +132,7 @@ void schedule() {
             }
 
             // Safe to free resources now because we are NOT running on this stack
+            free(to_free->cwd);
             destroy_page_dir(to_free->pagedir);
             free_page((void*)virt_to_phys(to_free->kstack));
             free_page((void*)virt_to_phys(to_free));