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sata_fsl: fix error handling of irq_of_parse_and_map
commit aad0b624129709c94c2e19e583b6053520353fa8 upstream. irq_of_parse_and_map() returns 0 on error (the result is unsigned int), so testing for negative result never works. Signed-off-by: Dmitry Torokhov <dtor@chromium.org> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Zefan Li <lizefan@huawei.com>
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