spi: ppc4xx: Revert "handle irq_of_parse_and_map() errors"

The commit had been applied twice as
  0f245463 ("spi: ppc4xx: handle irq_of_parse_and_map() errors")
and
  f1011ba2 ("spi: ppc4xx: handle irq_of_parse_and_map() errors")

This reverts commit f1011ba2.

Fixes: f1011ba2 ("spi: ppc4xx: handle irq_of_parse_and_map() errors")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20240902102853.2476165-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-ppc4xx.c

@@ -415,9 +415,6 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
 		goto free_host;
 	hw->irqnum = ret;
 
-	if (hw->irqnum <= 0)
-		goto free_host;
-
 	ret = request_irq(hw->irqnum, spi_ppc4xx_int,
 			  0, "spi_ppc4xx_of", (void *)hw);
 	if (ret) {