[ARM] Wrap calls to descriptor handlers

This is part of Thomas Gleixner's generic IRQ patch, which converts
ARM to use the generic IRQ subsystem.  Here, we wrap calls to
desc->handler() in an inline function, desc_handle_irq().  This
reduces the size of Thomas' patch since the changes become more
localised.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-s3c2410/irq.c b/arch/arm/mach-s3c2410/irq.c
index 6713879..66d8c06 100644
--- a/arch/arm/mach-s3c2410/irq.c
+++ b/arch/arm/mach-s3c2410/irq.c
@@ -496,11 +496,11 @@
 	if (subsrc != 0) {
 		if (subsrc & 1) {
 			mydesc = irq_desc + IRQ_TC;
-			mydesc->handle( IRQ_TC, mydesc, regs);
+			desc_handle_irq(IRQ_TC, mydesc, regs);
 		}
 		if (subsrc & 2) {
 			mydesc = irq_desc + IRQ_ADC;
-			mydesc->handle(IRQ_ADC, mydesc, regs);
+			desc_handle_irq(IRQ_ADC, mydesc, regs);
 		}
 	}
 }
@@ -529,17 +529,17 @@
 		desc = irq_desc + start;
 
 		if (subsrc & 1)
-			desc->handle(start, desc, regs);
+			desc_handle_irq(start, desc, regs);
 
 		desc++;
 
 		if (subsrc & 2)
-			desc->handle(start+1, desc, regs);
+			desc_handle_irq(start+1, desc, regs);
 
 		desc++;
 
 		if (subsrc & 4)
-			desc->handle(start+2, desc, regs);
+			desc_handle_irq(start+2, desc, regs);
 	}
 }