[PATCH] xen-blkback: really don't leak mode property

[Jan Beulich]

Commit 9d092603cc ("xen-blkback: do not leak mode property") left one
path unfixed; correct this.

Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
 drivers/block/xen-blkback/xenbus.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- 4.7-rc6-xen.orig/drivers/block/xen-blkback/xenbus.c
+++ 4.7-rc6-xen/drivers/block/xen-blkback/xenbus.c
@@ -715,8 +715,11 @@ static void backend_changed(struct xenbu
 
        /* Front end dir is a number, which is used as the handle. */
        err = kstrtoul(strrchr(dev->otherend, '/') + 1, 0, &handle);
-       if (err)
+       if (err) {
+               kfree(be->mode);
+               be->mode = NULL;
                return;
+       }
 
        be->major = major;
        be->minor = minor;