Cleanup: Sloppy use of "main" inside of "main()", oops.

Cleanup: Sloppy use of "main" inside of "main()", oops.

I cannot believe I let this one slip through (and so did the compilers).

When I refactored "data" to be "main" this included the refactor in the function called "main".

This is dangerous at worst and at best bad practice.
Given that "data" is no longer to be used in the main(), just rename the uses of "main" back to "data" for the variable name only (not the typedef structure name).