tracing: left align location header in stack_trace

Ingo Molnar suggested, instead of:

        Depth    Size      Location    (27 entries)
        -----    ----      --------
  0)     2880      48   lock_timer_base+0x2b/0x4f
  1)     2832      80   __mod_timer+0x33/0xe0
  2)     2752      16   __ide_set_handler+0x63/0x65

To have it be:

        Depth    Size   Location    (27 entries)
        -----    ----   --------
  0)     2880      48   lock_timer_base+0x2b/0x4f
  1)     2832      80   __mod_timer+0x33/0xe0
  2)     2752      16   __ide_set_handler+0x63/0x65

Requested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Steven Rostedt <srostedt@redhat.com>

kernel/trace/trace_stack.c

@@ -262,9 +262,9 @@ static int t_show(struct seq_file *m, void *v)
 	int size;
 
 	if (v == SEQ_START_TOKEN) {
-		seq_printf(m, "        Depth    Size      Location"
+		seq_printf(m, "        Depth    Size   Location"
 			   "    (%d entries)\n"
-			   "        -----    ----      --------\n",
+			   "        -----    ----   --------\n",
 			   max_stack_trace.nr_entries);
 
 		if (!stack_tracer_enabled && !max_stack_size)