[patch -next] renesas: missing unlock on error path

[Dan Carpenter]

We need to unlock before returning here.

Fixes: a0d2f20650e8 ('Renesas Ethernet AVB PTP clock driver')
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/net/ethernet/renesas/ravb_ptp.c 
b/drivers/net/ethernet/renesas/ravb_ptp.c
index 42656da..7a8ce92 100644
--- a/drivers/net/ethernet/renesas/ravb_ptp.c
+++ b/drivers/net/ethernet/renesas/ravb_ptp.c
@@ -116,8 +116,10 @@ static int ravb_ptp_adjfreq(struct ptp_clock_info *ptp, 
s32 ppb)
        priv->ptp.current_addend = addend;
 
        gccr = ravb_read(ndev, GCCR);
-       if (gccr & GCCR_LTI)
+       if (gccr & GCCR_LTI) {
+               spin_unlock_irqrestore(&priv->lock, flags);
                return -EBUSY;
+       }
        ravb_write(ndev, addend & GTI_TIV, GTI);
        ravb_write(ndev, gccr | GCCR_LTI, GCCR);
 
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