Staging: rtl8192u: Fix quoted string split across lines

This patch fixes checkpatch.pl warning in file ieee80211_crypt.c
WARNING: "quoted string split across lines warning"

Signed-off-by: Dilek Uzulmez <dilekuzulmez@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>