isdn: hisax: Handle return value of pnp_irq and pnp_port_start
pnp_irq() and pnp_port_start() can fail here and we must check its return value. Signed-off-by: NArvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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