runtime-rs: fix the bug of func count_files

[gaohuatao-1]

When the total number of files observed is greater than limit, return -1 directly. runtime has fixed this bug, it should b ported to runtime-rs.

Fixes:#9829

[justxuewei]

/test

[justxuewei]

@gaohuatao-1 Thanks for bringing this to runtime-rs. Could you mind adding some unit tests to the method?

[Apokleos]

Thx @gaohuatao-1 It looks good for me but lacks the UT of such general function.

[justxuewei]

/test

[justxuewei]

Lgtm, thanks!

[gaohuatao-1]

@justxuewei @Apokleos I have added a ut to the method. PTAL again, thanks.

[justxuewei]

/test

[gaohuatao-1]

@Apokleos Hi, PTAL, Thanks.

[Apokleos]

Thx @gaohuatao-1 Compared with CountFiles in kata runtime with golang, this commit looks good to me.
But I try to set the limit < 0 (limit declared as i32), the UT fails. I think the argument limit: i32 in count_files() shoud be change as limit: u32, maybe it's another bug, what do you think ?

[gaohuatao-1]

Thx @gaohuatao-1 Compared with CountFiles in kata runtime with golang, this commit looks good to me. But I try to set the limit < 0 (limit declared as i32), the UT fails. I think the argument limit: i32 in count_files() shoud be change as limit: u32, maybe it's another bug, what do you think ?
@Apokleos Thanks for your reply.
If the input param limit of func count_files is smaller than zero, test_count_files is still passed. Of course, you cannot set the local var limit to -1 in func test_count_files(). Could you please post your test code?