perf hists: Factor out hists__reset_column_width()

The stdio and tui has same code to reset hpp format column width.
Factor it out as a new function.

Suggested-and-Acked-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20160920053025.13989-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index a57131e..8e1840b 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -717,8 +717,6 @@
 		      int max_cols, float min_pcnt, FILE *fp,
 		      bool use_callchain)
 {
-	struct perf_hpp_fmt *fmt;
-	struct perf_hpp_list_node *node;
 	struct rb_node *nd;
 	size_t ret = 0;
 	const char *sep = symbol_conf.field_sep;
@@ -729,13 +727,7 @@
 
 	init_rem_hits();
 
-	hists__for_each_format(hists, fmt)
-		perf_hpp__reset_width(fmt, hists);
-	/* hierarchy entries have their own hpp list */
-	list_for_each_entry(node, &hists->hpp_formats, list) {
-		perf_hpp_list__for_each_format(&node->hpp, fmt)
-			perf_hpp__reset_width(fmt, hists);
-	}
+	hists__reset_column_width(hists);
 
 	if (symbol_conf.col_width_list_str)
 		perf_hpp__set_user_width(symbol_conf.col_width_list_str);