ocfs2: remove empty extent list check in ocfs2_dx_dir_lookup_rec()

The full extent list check is introduced by commit 44acc46, which is
to avoid NULL pointer dereference if a dirent is not found.

Reworking the error message to not reference rec.  Instead, report
major_hash being looked up and l_next_free_rec, which naturally covers
both failure cases (empty extent list and no matching record) without
needing a separate l_next_free_rec == 0 guard.

Link: https://lkml.kernel.org/r/20260403090803.3860971-3-joseph.qi@linux.alibaba.com
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: josephhz

fs/ocfs2/dir.c

@@ -835,14 +835,6 @@ static int ocfs2_dx_dir_lookup_rec(struct inode *inode,
 		}
 	}
 
-	if (le16_to_cpu(el->l_next_free_rec) == 0) {
-		ret = ocfs2_error(inode->i_sb,
-				  "Inode %lu has empty extent list at depth %u\n",
-				  inode->i_ino,
-				  le16_to_cpu(el->l_tree_depth));
-		goto out;
-	}
-
 	found = 0;
 	for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
 		rec = &el->l_recs[i];
@@ -855,10 +847,9 @@ static int ocfs2_dx_dir_lookup_rec(struct inode *inode,
 
 	if (!found) {
 		ret = ocfs2_error(inode->i_sb,
-				  "Inode %lu has bad extent record (%u, %u, 0) in btree\n",
-				  inode->i_ino,
-				  le32_to_cpu(rec->e_cpos),
-				  ocfs2_rec_clusters(el, rec));
+				  "Inode %lu has no extent record for hash %u in btree (next_free_rec %u)\n",
+				  inode->i_ino, major_hash,
+				  le16_to_cpu(el->l_next_free_rec));
 		goto out;
 	}