fs: Fix return in jfs_mkdir and orangefs_mkdir

[ Upstream commit a7cf1da7ac ]

Return NULL instead of passing to ERR_PTR while err is zero
Fixes these smatch warnings:
  - fs/jfs/namei.c:311 jfs_mkdir() warn: passing zero to 'ERR_PTR'
  - fs/orangefs/namei.c:369 orangefs_mkdir() warn: passing zero
    to 'ERR_PTR'

Fixes: 88d5baf690 ("Change inode_operations.mkdir to return struct dentry *")
Signed-off-by: Hongling Zeng <zenghongling@kylinos.cn>
Link: https://patch.msgid.link/20260501071058.1243245-1-zenghongling@kylinos.cn
Reviewed-by: Jori Koolstra <jkoolstra@xs4all.nl>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

fs/jfs/namei.c

@@ -308,7 +308,7 @@ static struct dentry *jfs_mkdir(struct mnt_idmap *idmap, struct inode *dip,
       out1:
 
 	jfs_info("jfs_mkdir: rc:%d", rc);
-	return ERR_PTR(rc);
+	return rc ? ERR_PTR(rc) : NULL;
 }
 
 /*

fs/orangefs/namei.c

@@ -362,7 +362,7 @@ static struct dentry *orangefs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
 	__orangefs_setattr(dir, &iattr);
 out:
 	op_release(new_op);
-	return ERR_PTR(ret);
+	return ret ? ERR_PTR(ret) : NULL;
 }
 
 static int orangefs_rename(struct mnt_idmap *idmap,