HSI: nokia-modem: fix error handling of irq_of_parse_and_map
Return value of irq_of_parse_and_map() is unsigned int, with 0 indicating failure, so testing for negative result never works. Signed-off-by: NDmitry Torokhov <dtor@chromium.org> Signed-off-by: NSebastian Reichel <sre@kernel.org>
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