staging: rtl8187se: Use min_t instead of min

Use min_t instead of min function in ieee80211/ieee80211_wx.c

Fix sparse warnings:
WARNING: min() should probably be min_t(u8, network->ssid_len, 32)

Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>