net:ethernet:aquantia: Missing spinlock initialization.

Fix for missing initialization aq_ring header.lock spinlock.

Fixes: 018423e ("net: ethernet: aquantia: Add ring support code")

Signed-off-by: Pavel Belous <pavel.belous@aquantia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/aquantia/atlantic/aq_ring.c

@@ -101,6 +101,7 @@ int aq_ring_init(struct aq_ring_s *self)
 	self->hw_head = 0;
 	self->sw_head = 0;
 	self->sw_tail = 0;
+	spin_lock_init(&self->header.lock);
 	return 0;
 }