staging: rtl8192u:add space before '(' and '{'

Fixes checkpatch.pl errors:
ERROR: space required before the open parenthesis '('
ERROR: space required before the open brace '{'

Signed-off-by: Aastha Gupta <aastha.gupta4104@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>