staging: ced1401: userspace: use1401.c: Cleaning up if statement that always evaluates to true

Unsigned variable can't be negative so it is unnecessary to test it.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>