unused variable

OK, it turns out myXID is only used by Assert tests, and most developers
compile with Asserts. I have fixed this by defining the variable only
when asserts are enabled.

Patch attached and applied.

---------------------------------------------------------------------------

Gaetano Mendola wrote:
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Hi all,

I'm compiling the last postgres CVS version and I get:

vacuum.c: In function `repair_frag':
vacuum.c:1528: warning: unused variable `myXID'

Regards
Gaetano Mendola

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