[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-versatile/core.c b/arch/arm/mach-versatile/core.c
index f01c0f8..3c8862f 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -108,7 +108,7 @@
 		irq += IRQ_SIC_START;
 
 		desc = irq_desc + irq;
-		desc->handle(irq, desc, regs);
+		desc_handle_irq(irq, desc, regs);
 	} while (status);
 }