shallow: remove unused code

Commit 58babfff ("shallow.c: the 8 steps to select new commits for
.git/shallow", 05-12-2013) added a function to implement step 5 of
the quoted eight steps, namely 'remove_nonexistent_ours_in_pack()'.
This function implements an optional optimization step in the new
shallow commit selection algorithm. However, this function has no
callers. (The commented out call sites would need to change, in
order to provide information required by the function.)
Signed-off-by: NRamsay Jones <ramsay@ramsay1.demon.co.uk>
Acked-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin/receive-pack.c

@@ -1059,7 +1059,6 @@ static void update_shallow_info(struct command *commands,
 	struct command *cmd;
 	int *ref_status;
 	remove_nonexistent_theirs_shallow(si);
-	/* XXX remove_nonexistent_ours_in_pack() */
 	if (!si->nr_ours && !si->nr_theirs) {
 		shallow_update = 0;
 		return;

commit.h

@@ -229,8 +229,6 @@ struct shallow_info {
 extern void prepare_shallow_info(struct shallow_info *, struct sha1_array *);
 extern void clear_shallow_info(struct shallow_info *);
 extern void remove_nonexistent_theirs_shallow(struct shallow_info *);
-extern void remove_nonexistent_ours_in_pack(struct shallow_info *,
-					    struct packed_git *);
 extern void assign_shallow_commits_to_refs(struct shallow_info *info,
 					   uint32_t **used,
 					   int *ref_status);

fetch-pack.c

@@ -986,7 +986,6 @@ static void update_shallow(struct fetch_pack_args *args,
 		return;
 
 	remove_nonexistent_theirs_shallow(si);
-	/* XXX remove_nonexistent_ours_in_pack() */
 	if (!si->nr_ours && !si->nr_theirs)
 		return;
 	for (i = 0; i < nr_sought; i++)

shallow.c

@@ -359,22 +359,6 @@ void remove_nonexistent_theirs_shallow(struct shallow_info *info)
 	info->nr_theirs = dst;
 }
 
-/* Step 5, remove non-existent ones in "ours" in the pack */
-void remove_nonexistent_ours_in_pack(struct shallow_info *info,
-				     struct packed_git *p)
-{
-	unsigned char (*sha1)[20] = info->shallow->sha1;
-	int i, dst;
-	trace_printf_key(TRACE_KEY, "shallow: remove_nonexistent_ours_in_pack\n");
-	for (i = dst = 0; i < info->nr_ours; i++) {
-		if (i != dst)
-			info->ours[dst] = info->ours[i];
-		if (find_pack_entry_one(sha1[info->ours[i]], p))
-			dst++;
-	}
-	info->nr_ours = dst;
-}
-
 define_commit_slab(ref_bitmap, uint32_t *);
 
 struct paint_info {