[patch] RDMA/cxgb4: release mutex on error in c4iw_reject_cr()

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We recently added some locking to this function and there was an error
path which missed the unlock.

Fixes: 9306dcbc96f3 ('RDMA/cxgb4: Lock around accept/reject downcalls')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c
index 303e29c..f3753a1 100644
--- a/drivers/infiniband/hw/cxgb4/cm.c
+++ b/drivers/infiniband/hw/cxgb4/cm.c
@@ -2524,6 +2524,7 @@ int c4iw_reject_cr(struct iw_cm_id *cm_id, const void *pdata, u8 pdata_len)
 
 	mutex_lock(&ep->com.mutex);
 	if (ep->com.state == DEAD) {
+		mutex_unlock(&ep->com.mutex);
 		c4iw_put_ep(&ep->com);
 		return -ECONNRESET;
 	}
--
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