[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-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index 6cf35f6..539b596 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -157,7 +157,7 @@
 			mask >>= 2;
 			do {
 				if (mask & 1)
-					desc->handle(irq, desc, regs);
+					desc_handle_irq(irq, desc, regs);
 				irq++;
 				desc++;
 				mask >>= 1;
@@ -172,7 +172,7 @@
 			desc = irq_desc + irq;
 			do {
 				if (mask & 1)
-					desc->handle(irq, desc, regs);
+					desc_handle_irq(irq, desc, regs);
 				irq++;
 				desc++;
 				mask >>= 1;
@@ -187,7 +187,7 @@
 			desc = irq_desc + irq;
 			do {
 				if (mask & 1)
-					desc->handle(irq, desc, regs);
+					desc_handle_irq(irq, desc, regs);
 				irq++;
 				desc++;
 				mask >>= 1;
@@ -203,7 +203,7 @@
 			desc = irq_desc + irq;
 			do {
 				if (mask & 1)
-					desc->handle(irq, desc, regs);
+					desc_handle_irq(irq, desc, regs);
 				irq++;
 				desc++;
 				mask >>= 1;