greybus: es2: drop short control-transfer checks

There's no need to check for short USB control transfers when sending
data using so remove the redundant sanity checks.

Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210118144629.25533-1-johan@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>