Merge branch 'jc/dirstat-plug-leaks'

"git diff --dirstat" leaked memory, which has been plugged.

* jc/dirstat-plug-leaks:
  diff: plug leaks in dirstat
  diff: refactor common tail part of dirstat computation

diff.c

@@ -3007,6 +3007,24 @@ static int dirstat_compare(const void *_a, const void *_b)
 	return strcmp(a->name, b->name);
 }
 
+static void conclude_dirstat(struct diff_options *options,
+			     struct dirstat_dir *dir,
+			     unsigned long changed)
+{
+	struct dirstat_file *to_free = dir->files;
+
+	if (!changed) {
+		/* This can happen even with many files, if everything was renames */
+		;
+	} else {
+		/* Show all directories with more than x% of the changes */
+		QSORT(dir->files, dir->nr, dirstat_compare);
+		gather_dirstat(options, dir, changed, "", 0);
+	}
+
+	free(to_free);
+}
+
 static void show_dirstat(struct diff_options *options)
 {
 	int i;
@@ -3096,13 +3114,7 @@ found_damage:
 		dir.nr++;
 	}
 
-	/* This can happen even with many files, if everything was renames */
-	if (!changed)
-		return;
-
-	/* Show all directories with more than x% of the changes */
-	QSORT(dir.files, dir.nr, dirstat_compare);
-	gather_dirstat(options, &dir, changed, "", 0);
+	conclude_dirstat(options, &dir, changed);
 }
 
 static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *options)
@@ -3140,13 +3152,7 @@ static void show_dirstat_by_line(struct diffstat_t *data, struct diff_options *o
 		dir.nr++;
 	}
 
-	/* This can happen even with many files, if everything was renames */
-	if (!changed)
-		return;
-
-	/* Show all directories with more than x% of the changes */
-	QSORT(dir.files, dir.nr, dirstat_compare);
-	gather_dirstat(options, &dir, changed, "", 0);
+	conclude_dirstat(options, &dir, changed);
 }
 
 static void free_diffstat_file(struct diffstat_file *f)

t/t4047-diff-dirstat.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='diff --dirstat tests'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # set up two commits where the second commit has these files