Fix module_param() type for zfs_read_chunk_size

zfs_read_chunk_size is unsigned long.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Closes openzfs#9051

module/zfs/zfs_vnops.c

@@ -5260,9 +5260,11 @@ EXPORT_SYMBOL(zfs_putpage);
 EXPORT_SYMBOL(zfs_dirty_inode);
 EXPORT_SYMBOL(zfs_map);
 
-/* CSTYLED */
+/* BEGIN CSTYLED */
 module_param(zfs_delete_blocks, ulong, 0644);
 MODULE_PARM_DESC(zfs_delete_blocks, "Delete files larger than N blocks async");
-module_param(zfs_read_chunk_size, long, 0644);
+module_param(zfs_read_chunk_size, ulong, 0644);
 MODULE_PARM_DESC(zfs_read_chunk_size, "Bytes to read per chunk");
+/* END CSTYLED */
+
 #endif