ceph: fix bad pointer dereference in ceph_fill_trace

We dereference *in a few lines down, but only set it on rename. It is
apparently pretty rare for this to trigger, but I have been hitting it
with a clustered MDSs.

Signed-off-by: Sage Weil <[e-mail]>

fs/ceph/inode.c

···
 		ininfo = rinfo->targeti.in;
 		vino.ino = le64_to_cpu(ininfo->ino);
 		vino.snap = le64_to_cpu(ininfo->snapid);
-		if (!dn->d_inode) {
+		in = dn->d_inode;
+		if (!in) {
 			in = ceph_get_inode(sb, vino);
 			if (IS_ERR(in)) {
 				pr_err("fill_trace bad get_inode "