ubi: Fix broken cleanup code in attach_by_scanning

The unwind code was not reversing operations correctly and was causing
a hang on any error condition.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/mtd/ubi/build.c

@@ -478,19 +478,19 @@ static int attach_by_scanning(struct ubi_device *ubi)
 
 	err = ubi_eba_init_scan(ubi, si);
 	if (err)
-		goto out_wl;
+		goto out_vtbl;
 
 	err = ubi_wl_init_scan(ubi, si);
 	if (err)
-		goto out_vtbl;
+		goto out_eba;
 
 	ubi_scan_destroy_si(si);
 	return 0;
 
+out_eba:
+	ubi_eba_close(ubi);
 out_vtbl:
 	vfree(ubi->vtbl);
-out_wl:
-	ubi_wl_close(ubi);
 out_si:
 	ubi_scan_destroy_si(si);
 	return err;

drivers/mtd/ubi/wl.c

@@ -1538,6 +1538,7 @@ int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si)
 	if (ubi->avail_pebs < WL_RESERVED_PEBS) {
 		ubi_err("no enough physical eraseblocks (%d, need %d)",
 			ubi->avail_pebs, WL_RESERVED_PEBS);
+		err = -ENOSPC;
 		goto out_free;
 	}
 	ubi->avail_pebs -= WL_RESERVED_PEBS;