samples/kretprobe: fix the wrong type

The regs_return_value() returns "unsigned long" or "long" value.  But the
retval is int type now, it may cause overflow, the log may becomes:

    [ 2911.078869] do_brk returned -2003877888 and took 4620 ns to execute

This patch converts the retval to "unsigned long" type, and fixes the
overflow issue.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Huang Shijie <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Steve Capper <[email protected]>
Cc: Ananth N Mavinakayanahalli <[email protected]>
Cc: Anil S Keshavamurthy <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: Huang Shijie

samples/kprobes/kretprobe_example.c

@@ -55,14 +55,14 @@ static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
  */
 static int ret_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
 {
-	int retval = regs_return_value(regs);
+	unsigned long retval = regs_return_value(regs);
 	struct my_data *data = (struct my_data *)ri->data;
 	s64 delta;
 	ktime_t now;
 
 	now = ktime_get();
 	delta = ktime_to_ns(ktime_sub(now, data->entry_stamp));
-	pr_info("%s returned %d and took %lld ns to execute\n",
+	pr_info("%s returned %lu and took %lld ns to execute\n",
 			func_name, retval, (long long)delta);
 	return 0;
 }