net: dsa: mv88e6xxx: Fix unconditional irq freeing
Trying to remove an IRQ domain that was not created results in an Opps. Add the necessary checks that the irqs were created before freeing them. Signed-off-by: NAndrew Lunn <andrew@lunn.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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