scsi: hisi_sas: Fix IRQ checks

scsi: hisi_sas: Fix IRQ checks

Commit df2d8213d9e3 ("hisi_sas: use platform_get_irq()") failed to take
into account that irq_of_parse_and_map() and platform_get_irq() have a
different way of indicating an error: the former returns 0 and the latter
returns a negative error code. Fix up the IRQ checks!

Link: https://lore.kernel.org/r/[email protected]
Fixes: df2d8213d9e3 ("hisi_sas: use platform_get_irq()")
Acked-by: John Garry <[email protected]>
Signed-off-by: Sergey Shtylyov <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>