USB: s3c-hsotg: fix checkpatch warnings

This patch fixes the checkpatch warnings listed below:

WARNING: braces {} are not necessary for any arm of this statement
WARNING: please, no space before tabs

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>