staging: rtl8192u: fix '{' following enum go on the same line

Fixes checkpatch.pl error:
ERROR: open brace '{' following enum go on the same line

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