Fix a typo causing a warning in the arm oprofile backtrace code.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

Index: linux-2.6.12/arch/arm/oprofile/backtrace.c
===================================================================
--- linux-2.6.12.orig/arch/arm/oprofile/backtrace.c	2005-07-25 10:08:37.000000000 +0100
+++ linux-2.6.12/arch/arm/oprofile/backtrace.c	2005-07-28 15:32:10.000000000 +0100
@@ -115,7 +115,7 @@
 	return (tailaddr > stack) && (tailaddr < stack_base);
 }
 
-void arm_backtrace(struct pt_regs const *regs, unsigned int depth)
+void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
 {
 	struct frame_tail *tail;
 	unsigned long last_address = 0;