[check_postgres] Quick patch for check_wal_files() function

[Guillaume Lelarge]

Hi again,

One of my colleague found a bug in check_wal_files() function while
doing a demo to on of our customer.

Here is the patch to fix it. The issue is that q{} doesn't allow the use
of a variable inside the string. qq{} takes care of it.

Regards.


-- 
Guillaume
 http://www.postgresql.fr
 http://dalibo.com
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