When it removes an output format for cancelled children or latency, it
should delete itself from the sort list as well.  Otherwise assertion
in fmt_free() will fire.

  $ perf report -H --stdio
  perf: ui/hist.c:603: fmt_free: Assertion `!(!list_empty(&fmt->sort_list))' failed.
  Aborted (core dumped)

Also convert to perf_hpp__column_unregister() for the same open codes.

Fixes: dbd11b6bdab12f60 ("perf hist: Remove formats in hierarchy when cancel children")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/ui/hist.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c
index 3ffce69fc823e0bf..bc0689fceeb18bde 100644
--- a/tools/perf/ui/hist.c
+++ b/tools/perf/ui/hist.c
@@ -696,6 +696,7 @@ void perf_hpp_list__prepend_sort_field(struct perf_hpp_list *list,
 static void perf_hpp__column_unregister(struct perf_hpp_fmt *format)
 {
 	list_del_init(&format->list);
+	list_del_init(&format->sort_list);
 	fmt_free(format);
 }
 
@@ -818,18 +819,12 @@ void perf_hpp__reset_output_field(struct perf_hpp_list *list)
 	struct perf_hpp_fmt *fmt, *tmp;
 
 	/* reset output fields */
-	perf_hpp_list__for_each_format_safe(list, fmt, tmp) {
-		list_del_init(&fmt->list);
-		list_del_init(&fmt->sort_list);
-		fmt_free(fmt);
-	}
+	perf_hpp_list__for_each_format_safe(list, fmt, tmp)
+		perf_hpp__column_unregister(fmt);
 
 	/* reset sort keys */
-	perf_hpp_list__for_each_sort_list_safe(list, fmt, tmp) {
-		list_del_init(&fmt->list);
-		list_del_init(&fmt->sort_list);
-		fmt_free(fmt);
-	}
+	perf_hpp_list__for_each_sort_list_safe(list, fmt, tmp)
+		perf_hpp__column_unregister(fmt);
 }
 
 /*
-- 
2.49.0.906.g1f30a19c02-goog