ext2: initialize quota info in ext2_xattr_set()

In order to correctly account/limit space usage, should initialize
quota info before calling quota related functions.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Chengguang Xu <[e-mail]>
Reviewed-by: Reviewed-by: Ritesh Harjani <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>

fs/ext2/xattr.c

···
 	name_len = strlen(name);
 	if (name_len > 255 || value_len > sb->s_blocksize)
 		return -ERANGE;
+	error = dquot_initialize(inode);
+	if (error)
+		return error;
 	down_write(&EXT2_I(inode)->xattr_sem);
 	if (EXT2_I(inode)->i_file_acl) {
 		/* The inode already has an extended attribute block. */