pack-bitmap.c: don't leak type-level bitmaps

test_bitmap_walk() is used to implement `git rev-list --test-bitmap`,
which compares the result of the on-disk bitmaps with ones generated
on-the-fly during a revision walk.

In fa95666 (pack-bitmap.c: harden 'test_bitmap_walk()' to check type
bitmaps, 2021-08-24), we hardened those tests to also check the four
special type-level bitmaps, but never freed those bitmaps. We should
have, since each required an allocation when we EWAH-decompressed them.

Free those, plugging that leak, and also free the base (the scratch-pad
bitmap), too.

Signed-off-by: Taylor Blau <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ttaylorr

pack-bitmap.c

@@ -1726,6 +1726,12 @@ void test_bitmap_walk(struct rev_info *revs)
 	else
 		die("mismatch in bitmap results");
 
+	bitmap_free(result);
+	bitmap_free(tdata.base);
+	bitmap_free(tdata.commits);
+	bitmap_free(tdata.trees);
+	bitmap_free(tdata.blobs);
+	bitmap_free(tdata.tags);
 	free_bitmap_index(bitmap_git);
 }