revision: fix memory leak when reversing revisions

When reversing revisions in a rev walk, `get_revision()` will allocate a
new commit list and assign it to `revs->commits`. It does not free the
old list though, which makes it leak. Fix this.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

revision.c

@@ -4430,6 +4430,7 @@ struct commit *get_revision(struct rev_info *revs)
 		reversed = NULL;
 		while ((c = get_revision_internal(revs)))
 			commit_list_insert(c, &reversed);
+		free_commit_list(revs->commits);
 		revs->commits = reversed;
 		revs->reverse = 0;
 		revs->reverse_output_stage = 1;

t/t3508-cherry-pick-many-commits.sh

@@ -5,6 +5,7 @@ test_description='test cherry-picking many commits'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_head_differs_from() {