usb: usbtest: Remove stack VLA usage
The kernel would like to have all stack VLA usage removed[1]. We already have a pre-processor constant defined MAX_SGLEN. We can use this instead of the variable param-sglen. [1]: https://lkml.org/lkml/2018/3/7/621Signed-off-by: NTobin C. Harding <me@tobin.cc> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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