soc: xilinx: Do not check for 0 return after calling platform_get_irq()

There is no possible for platform_get_irq() to
return 0. Use the return value from platform_get_irq().

Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20230803104807.814005-3-ruanjinjie@huawei.com


Signed-off-by: Michal Simek <michal.simek@amd.com>