fix: task: use 8bit represent ptr instead of 32 to fix stack ptr

src/multitasking/fork.c

@@ -12,7 +12,7 @@ u16 fork(void)
 	child->daddy = current_task;
 	current_task->child = child;
 	memcpy(child->esp0, current_task->esp0, STACK_SIZE);
-	u32 *daddy_esp = 0;
+	u8 *daddy_esp;
 	asm("movl %%esp, %0" : "=m"(daddy_esp));
 	child->esp = child->esp0 + (daddy_esp - current_task->esp0);
 	toris();