rtl8192du: Fix build problem for kernels older than 2.6.35

There is an unbalanced number of parens for older kernels.

From: jflemingeds through notifications@github.com
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
rtl8192du: Fix some endian issues

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>