ceph: fix possible null-pointer dereference in ceph_mdsmap_decode()

kcalloc() is called to allocate memory for m->m_info, and if it fails,
ceph_mdsmap_destroy() behind the label out_err will be called:
  ceph_mdsmap_destroy(m);

In ceph_mdsmap_destroy(), m->m_info is dereferenced through:
  kfree(m->m_info[i].export_targets);

To fix this possible null-pointer dereference, check m->m_info before the
for loop to free m->m_info[i].export_targets.

[ jlayton: fix up whitespace damage
	   only kfree(m->m_info) if it's non-NULL ]
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn>
Signed-off-by: Tuo Li <islituo@gmail.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

fs/ceph/mdsmap.c

@@ -394,9 +394,11 @@ void ceph_mdsmap_destroy(struct ceph_mdsmap *m)
 {
 	int i;
 
+	if (m->m_info) {
 		for (i = 0; i < m->possible_max_rank; i++)
 			kfree(m->m_info[i].export_targets);
 		kfree(m->m_info);
+	}
 	kfree(m->m_data_pg_pools);
 	kfree(m);
 }