staging: rtl8192u: fix braces in r8192U_core.c

This patch fixes the position of braces and removes
redundant braces, following the kernel coding style
conventions.
Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Reviewed-by: Dan Carpenter<dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>