staging: rtl8192u: make in ieee80211/ieee80211_wx.c a local variable static

Make some local variable eee80211_modes static.

Fix sparse warnings:
drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c:42:19: warning: symbol 'ieee80211_modes' was not declared. Should it be static?

Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c b/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
index e1fe54a..bdf67ec 100644
--- a/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
+++ b/drivers/staging/rtl8192u/ieee80211/ieee80211_wx.c
@@ -39,7 +39,7 @@
 	char *mode_string;
 	int mode_size;
 };
-struct modes_unit ieee80211_modes[] = {
+static struct modes_unit ieee80211_modes[] = {
 	{"a",1},
 	{"b",1},
 	{"g",1},