Staging: rtl8192u: do not use C99 // comments

This is a patch to convert C99-style comments to C89-style comments in
ieee80211_softmac_wx.c.

Signed-off-by: Mike Dupuis <mike.dupuis.0@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>