usb: cast sizeof() to int when comparing with error code

On Mon, Jun 25, 2018 at 03:35:18PM +0800, Chengguang Xu wrote:

Negative error code will be larger than sizeof().

Good catch!

I was gonna ask you to submit this as three separate patches to
facilitate stable backports, but fortunately it appears none of these
have any bad implications (besides possibly the ir-usb one printing a
less descriptive debug message).

So I'll queue this one of up for -next.

Thanks,
Johan
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