staging: rtl8712: fix unnecessary line continuations

This commit fixes the following checkpatch warning:

rtl8712/rtl871x_security.c
    - 1178: WARNING: Avoid unnecessary line continuations

Signed-off-by: Marcus Farkas <marcus.farkas@finitebox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>