[GFS2] Fix incorrect error path in prepare_write()

The error path in prepare_write() was incorrect in the (very rare) event
that the transaction fails to start. The following prevents a NULL
pointer dereference,

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index ce90032c010e..42a5f58f6fca 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -416,7 +416,7 @@ static int gfs2_prepare_write(struct file *file, struct page *page,
 
         error = gfs2_trans_begin(sdp, rblocks, 0);
         if (error)
-                goto out;
+                goto out_trans_fail;
 
         if (gfs2_is_stuffed(ip)) {
                 if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
@@ -434,6 +434,7 @@ prepare_write:
 out:
         if (error) {
                 gfs2_trans_end(sdp);
+out_trans_fail:
                 if (alloc_required) {
                         gfs2_inplace_release(ip);
 out_qunlock: