staging: rtl8192e: Fix smatch warning in rtl_wx.c

Smatch reports the following warning:

  CHECK   drivers/staging/rtl8192e/rtl_wx.c

drivers/staging/rtl8192e/rtl_wx.c +262 r8192se_wx_set_radio(16) warn: inconsistent returns sem:&priv->wx_sem: locked (258) unlocked (262)

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>