Fix: 字符数组expect_str越界

[xy420513]

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为什么提交这份PR (why to submit this PR)

在OpenAtomFoundation/TencentOS-tiny/devices/air724/air724.c这个文件中，第389行创建的字符数组expect_str大小只有10，后续412行sprintf的字符串明显超出了10的大小，会发生数组越界，出现问题

你的解决方案是什么 (what is your solution)

将expect_str字符数组开大空间, 考虑到使用%d时未指定位数，因此开辟24的空间来保证一定不会越界，且考虑数据对齐

在什么测试环境下测试通过 (what is the test environment)

all

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