arm64: Cast KSTK_(EIP|ESP) to unsigned long

This is for similarity with thread_saved_(pc|sp) and to avoid some
compiler warnings in the audit code.
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/processor.h

@@ -137,8 +137,8 @@ extern struct task_struct *cpu_switch_to(struct task_struct *prev,
 #define task_pt_regs(p) \
 	((struct pt_regs *)(THREAD_START_SP + task_stack_page(p)) - 1)
 
-#define KSTK_EIP(tsk)	task_pt_regs(tsk)->pc
-#define KSTK_ESP(tsk)	task_pt_regs(tsk)->sp
+#define KSTK_EIP(tsk)	((unsigned long)task_pt_regs(tsk)->pc)
+#define KSTK_ESP(tsk)	((unsigned long)task_pt_regs(tsk)->sp)
 
 /*
  * Prefetching support