linux-imx

USB: mos7840: remove redundant condition

This patch removes redundant condition.

 (length && length > 5) can be reduced to a single evaluation.

Tested by compilation only.
Caught by cppcheck.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>