refs API: ignore errno in worktree.c's find_shared_symref()

There are only handful of callers of find_shared_symref(), none of
whom care about errno, so let's migrate to the non-errno-propagating
version of refs_resolve_ref_unsafe() and explicitly ignore errno here.

Signed-off-by: Ævar Arnfjörð Bjarmason <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: avar

worktree.c

@@ -420,6 +420,7 @@ const struct worktree *find_shared_symref(const char *symref,
 		const char *symref_target;
 		struct ref_store *refs;
 		int flags;
+		int ignore_errno;
 
 		if (wt->is_bare)
 			continue;
@@ -436,8 +437,9 @@ const struct worktree *find_shared_symref(const char *symref,
 		}
 
 		refs = get_worktree_ref_store(wt);
-		symref_target = refs_resolve_ref_unsafe(refs, symref, 0,
-							NULL, &flags);
+		symref_target = refs_werrres_ref_unsafe(refs, symref, 0,
+							NULL, &flags,
+							&ignore_errno);
 		if ((flags & REF_ISSYMREF) &&
 		    symref_target && !strcmp(symref_target, target)) {
 			existing = wt;