check-uniq-files: fix code style

Fix these warnings:
E128 continuation line under-indented for visual indent
E302 expected 2 blank lines, found 1
E305 expected 2 blank lines after class or function definition, found 1

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Cc: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>