From 9a8c0fa861e4db60409b4dda254cef5e17e4d43c Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@suse.de>
Date: Thu, 25 Jun 2015 17:06:40 +1000
Subject: [PATCH] md: unlock mddev_lock on an error path.

This error path retuns while still holding the lock - bad.

Fixes: 6791875e2e53 ("md: make reconfig_mutex optional for writes to md sysfs files.")
Cc: stable@vger.kernel.org (v4.0+)
Signed-off-by: NeilBrown <neilb@suse.com>
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