staging: rtl8192u: ieee80211: ieee80211_wx: add space before open brace

Fix checkpatch error "ERROR: space required before the open brace
'{'" in ieee80211_wx.c.

Signed-off-by: Julius Hemanth Pitti <juliushemanth@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>