staging: rtl8192u: fix whitespace and alignment

This patch fixes warnings/errors raised by checkpatch.pl relating to whitespace
in r8192U_dm.c, removes inconsistent whitespace, and additionally fixes some
vertical alignment issues.
Signed-off-by: NLorenzo Stoakes <lstoakes@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>