perf hists: Replace perf_evsel arg perf_hpp_fmt's header callback

Replacing perf_evsel arg perf_hpp_fmt's header callback with hists
object.

None of the actual callbacks actually use evsel object, also this will
be helpful in future for non evsel related hist browsers.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1465928361-2442-10-git-send-email-jolsa@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 9a972cb..d0534fa 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -549,7 +549,7 @@
 				    struct perf_hpp_list_node, list);
 
 	perf_hpp_list__for_each_format(&fmt_node->hpp, fmt) {
-		fmt->header(fmt, hpp, hists_to_evsel(hists));
+		fmt->header(fmt, hpp, hists);
 		fprintf(fp, "%s%s", hpp->buf, sep ?: "  ");
 	}
 
@@ -569,7 +569,7 @@
 				header_width += fprintf(fp, "+");
 			first_col = false;
 
-			fmt->header(fmt, hpp, hists_to_evsel(hists));
+			fmt->header(fmt, hpp, hists);
 
 			header_width += fprintf(fp, "%s", trim(hpp->buf));
 		}
@@ -658,7 +658,7 @@
 		else
 			first = false;
 
-		fmt->header(fmt, hpp, hists_to_evsel(hists));
+		fmt->header(fmt, hpp, hists);
 		fprintf(fp, "%s", hpp->buf);
 	}