PCI: armada8k: Fix platform_get_irq() error handling
platform_get_irq() returns a negative number on failure, so adjust the logic to detect such condition and propagate the real error value on failure. Signed-off-by: NFabio Estevam <fabio.estevam@nxp.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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