qed: Unlock on error in qed_vf_pf_acquire()

My static checker complains that we're holding a mutex on this error
path.  Let's goto exit instead of returning directly.

Fixes: b0bccb69eba3 ("qed: Change locking scheme for VF channel")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Yuval Mintz <Yuval.Mintz@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qed/qed_vf.c

@@ -234,7 +234,7 @@ static int qed_vf_pf_acquire(struct qed_hwfn *p_hwfn)
 		/* send acquire request */
 		rc = qed_send_msg2pf(p_hwfn, &resp->hdr.status, sizeof(*resp));
 		if (rc)
-			return rc;
+			goto exit;
 
 		/* copy acquire response from buffer to p_hwfn */
 		memcpy(&p_iov->acquire_resp, resp, sizeof(p_iov->acquire_resp));