Squashfs: fix filename typo

Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>

fs/squashfs/squashfs.h

@@ -105,5 +105,5 @@ extern const struct xattr_handler *squashfs_xattr_handlers[];
 /* zlib_wrapper.c */
 extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
 
-/* lzo_wrappers.c */
+/* lzo_wrapper.c */
 extern const struct squashfs_decompressor squashfs_lzo_comp_ops;