f2fs: Move err variable to function scope in f2fs_fill_dentries()

This is preparation for the following backported fixes.  It was done
upstream as part of commit e1293bdf "f2fs: plug readahead IO in
readdir()", the rest of which does not seem suitable for stable.

Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/f2fs/dir.c

@@ -785,6 +785,7 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
 	struct f2fs_dir_entry *de = NULL;
 	struct fscrypt_str de_name = FSTR_INIT(NULL, 0);
 	struct f2fs_sb_info *sbi = F2FS_I_SB(d->inode);
+	int err = 0;
 
 	bit_pos = ((unsigned long)ctx->pos % d->max);
 
@@ -807,7 +808,6 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
 
 		if (f2fs_encrypted_inode(d->inode)) {
 			int save_len = fstr->len;
-			int err;
 
 			err = fscrypt_fname_disk_to_usr(d->inode,
 						(u32)de->hash_code, 0,
@@ -829,7 +829,8 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
 		bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
 		ctx->pos = start_pos + bit_pos;
 	}
-	return 0;
+out:
+	return err;
 }
 
 static int f2fs_readdir(struct file *file, struct dir_context *ctx)