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>

support/scripts/check-uniq-files

@@ -7,10 +7,11 @@ from collections import defaultdict
 
 warn = 'Warning: {} file "{}" is touched by more than one package: {}\n'
 
+
 def main():
     parser = argparse.ArgumentParser()
     parser.add_argument('packages_file_list', nargs='*',
-                    help='The packages-file-list to check from')
+                        help='The packages-file-list to check from')
     parser.add_argument('-t', '--type', metavar="TYPE",
                         help='Report as a TYPE file (TYPE is either target, staging, or host)')
 
@@ -36,5 +37,6 @@ def main():
         if len(file_to_pkg[file]) > 1:
             sys.stderr.write(warn.format(args.type, file, file_to_pkg[file]))
 
+
 if __name__ == "__main__":
     sys.exit(main())