ubifs: Fix memory leak on error condition

If the call to ubifs_read_nnode() fails in ubifs_lpt_calc_hash() an
error is returned without freeing the memory allocated to 'buf'.
Read and check the root node before allocating the buffer.

Detected by CoverityScan, CID 1441025 ("Resource leak")

Signed-off-by: Garry McNulty <[e-mail]>
Signed-off-by: Richard Weinberger <[e-mail]>

fs/ubifs/lpt.c

···
 	if (!ubifs_authenticated(c))
 		return 0;
 
+	if (!c->nroot) {
+		err = ubifs_read_nnode(c, NULL, 0);
+		if (err)
+			return err;
+	}
+
 	desc = ubifs_hash_get_desc(c);
 	if (IS_ERR(desc))
 		return PTR_ERR(desc);
···
 	if (!buf) {
 		err = -ENOMEM;
 		goto out;
-	}
-
-	if (!c->nroot) {
-		err = ubifs_read_nnode(c, NULL, 0);
-		if (err)
-			return err;
 	}
 
 	cnode = (struct ubifs_cnode *)c->nroot;