afs: remove redundant assignment of dvnode to itself

The assignment of dvnode to itself is redundant and can be removed.
Cleans up warning detected by cppcheck:

fs/afs/dir.c:975: (warning) Redundant assignment of 'dvnode' to itself.

Fixes: d2ddc776a458 ("afs: Overhaul volume and server record caching and fileserver rotation")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index c023249..ff8d5bf 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -974,7 +974,7 @@
 	struct afs_fs_cursor fc;
 	struct afs_file_status newstatus;
 	struct afs_callback newcb;
-	struct afs_vnode *dvnode = dvnode = AFS_FS_I(dir);
+	struct afs_vnode *dvnode = AFS_FS_I(dir);
 	struct afs_fid newfid;
 	struct key *key;
 	int ret;