Use zero_user_page() instead of open-coding it.

Signed-off-by: Nate Diller <nate.diller@gmail.com>
Cc: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 fs/gfs2/bmap.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)