fs/ntfs3: fix $LXDEV xattr lookup

Use correct xattr name ("$LXDEV") and buffer size when calling
ntfs_get_ea(), otherwise the attribute may not be read.

Signed-off-by: Zhan Xusheng <zhanxusheng@xiaomi.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Author: Zhan Xusheng

fs/ntfs3/xattr.c

@@ -1031,7 +1031,7 @@ void ntfs_get_wsl_perm(struct inode *inode)
 		i_gid_write(inode, (gid_t)le32_to_cpu(value[1]));
 		inode->i_mode = le32_to_cpu(value[2]);
 
-		if (ntfs_get_ea(inode, "$LXDEV", sizeof("$$LXDEV") - 1,
+		if (ntfs_get_ea(inode, "$LXDEV", sizeof("$LXDEV") - 1,
 				&value[0], sizeof(value),
 				&sz) == sizeof(value[0])) {
 			inode->i_rdev = le32_to_cpu(value[0]);