UBI: Enable re-initializing of the "ubi part" command

With this patch now, the user can call "ubi part" multiple times to
re-connect the UBI device to another MTD partition.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 17cabb2..bdf75c9 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1059,6 +1059,7 @@
 	misc_deregister(&ubi_ctrl_cdev);
 	class_remove_file(ubi_class, &ubi_version);
 	class_destroy(ubi_class);
+	mtd_devs = 0;
 }
 module_exit(ubi_exit);