spi: fsl: Call irq_dispose_mapping in err path

Irq_dispose_mapping should be called in err path to release
the resources that irq_of_parse_and_map requested.

Signed-off-by: Liu Xiang <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-fsl-spi.c

···
 	struct device_node *np = ofdev->dev.of_node;
 	struct spi_master *master;
 	struct resource mem;
-	int irq, type;
+	int irq = 0, type;
 	int ret = -ENOMEM;
 
 	ret = of_mpc8xxx_spi_probe(ofdev);
···
 	return 0;
 
 err:
+	irq_dispose_mapping(irq);
 	if (type == TYPE_FSL)
 		of_fsl_spi_free_chipselects(dev);
 	return ret;