BACKPORT: Staging: Fixes string split across lines in zram

(cherry pick from commit 596b3dd4c8e172db7806372c9d0347a4e7d28bc5)

Fixes the following checkpatch warning in zram_drv.c:
WARNING: quoted string split across lines

Bug: 25951511

Change-Id: I015e30679c49c0933d412327e456be641e4d062f
Signed-off-by: Marlies Ruck <marlies.ruck@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>