spmi/pmic: Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc

Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc while we
already have a pointer to corresponding irq_desc.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: http://lkml.kernel.org/r/20150713151750.915477120@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

drivers/spmi/spmi-pmic-arb.c

@@ -453,8 +453,8 @@ static void periph_interrupt(struct spmi_pmic_arb_dev *pa, u8 apid)
 
 static void pmic_arb_chained_irq(unsigned int irq, struct irq_desc *desc)
 {
-	struct spmi_pmic_arb_dev *pa = irq_get_handler_data(irq);
-	struct irq_chip *chip = irq_get_chip(irq);
+	struct spmi_pmic_arb_dev *pa = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
 	void __iomem *intr = pa->intr;
 	int first = pa->min_apid >> 5;
 	int last = pa->max_apid >> 5;