[PATCH 1/6] refs/files: remove duplicate check in `split_symref_update()`

[Karthik Nayak <karthik.188@gmail.com>]

In split_symref_update(), there were two redundant checks:
   - At the start: checking if refname exists in `affected_refnames`.
   - After adding refname: checking if the item added to
     `affected_refnames` contains the util field.

Remove the second check since the first one already prevents duplicate
refnames from being added to the transaction updates.

Since this is the only place that utilizes the `item->util` value, avoid
setting the value in the first place and cleanup code around it.

Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
---
 refs/files-backend.c | 20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 29f08dced40418eb815072c6335e0c3d1a45c7d8..c6a3f6d6261a894e1c294bb1329fdf8079a39eb4 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -2387,7 +2387,6 @@ static int split_head_update(struct ref_update *update,
 			     struct string_list *affected_refnames,
 			     struct strbuf *err)
 {
-	struct string_list_item *item;
 	struct ref_update *new_update;
 
 	if ((update->flags & REF_LOG_ONLY) ||
@@ -2426,8 +2425,7 @@ static int split_head_update(struct ref_update *update,
 	 */
 	if (strcmp(new_update->refname, "HEAD"))
 		BUG("%s unexpectedly not 'HEAD'", new_update->refname);
-	item = string_list_insert(affected_refnames, new_update->refname);
-	item->util = new_update;
+	string_list_insert(affected_refnames, new_update->refname);
 
 	return 0;
 }
@@ -2446,7 +2444,6 @@ static int split_symref_update(struct ref_update *update,
 			       struct string_list *affected_refnames,
 			       struct strbuf *err)
 {
-	struct string_list_item *item;
 	struct ref_update *new_update;
 	unsigned int new_flags;
 
@@ -2501,11 +2498,7 @@ static int split_symref_update(struct ref_update *update,
 	 * be valid as long as affected_refnames is in use, and NOT
 	 * referent, which might soon be freed by our caller.
 	 */
-	item = string_list_insert(affected_refnames, new_update->refname);
-	if (item->util)
-		BUG("%s unexpectedly found in affected_refnames",
-		    new_update->refname);
-	item->util = new_update;
+	string_list_insert(affected_refnames, new_update->refname);
 
 	return 0;
 }
@@ -2837,7 +2830,6 @@ static int files_transaction_prepare(struct ref_store *ref_store,
 	 */
 	for (i = 0; i < transaction->nr; i++) {
 		struct ref_update *update = transaction->updates[i];
-		struct string_list_item *item;
 
 		if ((update->flags & REF_IS_PRUNING) &&
 		    !(update->flags & REF_NO_DEREF))
@@ -2846,13 +2838,7 @@ static int files_transaction_prepare(struct ref_store *ref_store,
 		if (update->flags & REF_LOG_ONLY)
 			continue;
 
-		item = string_list_append(&affected_refnames, update->refname);
-		/*
-		 * We store a pointer to update in item->util, but at
-		 * the moment we never use the value of this field
-		 * except to check whether it is non-NULL.
-		 */
-		item->util = update;
+		string_list_append(&affected_refnames, update->refname);
 	}
 	string_list_sort(&affected_refnames);
 	if (ref_update_reject_duplicates(&affected_refnames, err)) {

-- 
2.47.0