The index_ptr memory that is allocated when printout is started
currently is only returned when the printout is stopped
prematurely. It is not returned when the printout regularly
finishes. Fix this memory leak.

Signed-off-by: Carsten Emde <C.Emde@osadl.org>

Index: linux-3.12.10-rt15-somedebug/kernel/trace/latency_hist.c
===================================================================
--- linux-3.12.10-rt15-somedebug.orig/kernel/trace/latency_hist.c
+++ linux-3.12.10-rt15-somedebug/kernel/trace/latency_hist.c
@@ -313,6 +313,7 @@ static void *l_next(struct seq_file *m, 
 
 	if (++*pos >= MAX_ENTRY_NUM) {
 		atomic_inc(&my_hist->hist_mode);
+		kfree(p);
 		return NULL;
 	}
 	*index_ptr = *pos;