Fix magic number in bucket declaration

[ibat10clw]

Replace hard-coded value 256 with BUCKET_SIZE macro for better readability and maintainability

Change-Id: I4b123b7267dcb9beac8d791fd1e7cb9b75a6b446

[jserv]

Properly tweak the layout of messages. That is,

Replace hard-coded value with BUCKET_SIZE macro for better readability
and maintainability.

[ibat10clw]

I have updated the commit message as requested. Please review the changes. Thanks!

[jserv]

I have updated the commit message as requested.

You can simply write as following:

Replace hard-coded value with BUCKET_SIZE macro for better readability.

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[jserv]

Thank @ibat10clw for contributing!