Only unlock mi->lock if it is locked. This bug has been detected by the Clang
thread-safety analyzer.

Cc: Leo Yang <Leo-Yang@quantatw.com>
Cc: Paolo Abeni <pabeni@redhat.com>
Fixes: 2d2d4f60ed26 ("mctp i3c: fix MCTP I3C driver multi-thread issue")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 drivers/net/mctp/mctp-i3c.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mctp/mctp-i3c.c b/drivers/net/mctp/mctp-i3c.c
index d247fe483c58..360eb6490483 100644
--- a/drivers/net/mctp/mctp-i3c.c
+++ b/drivers/net/mctp/mctp-i3c.c
@@ -112,7 +112,7 @@ static int mctp_i3c_read(struct mctp_i3c_device *mi)
 	if (!skb) {
 		stats->rx_dropped++;
 		rc = -ENOMEM;
-		goto err;
+		goto free_skb;
 	}
 
 	skb->protocol = htons(ETH_P_MCTP);
@@ -170,8 +170,11 @@ static int mctp_i3c_read(struct mctp_i3c_device *mi)
 
 	mutex_unlock(&mi->lock);
 	return 0;
+
 err:
 	mutex_unlock(&mi->lock);
+
+free_skb:
 	kfree_skb(skb);
 	return rc;
 }