tools/oxenstored: Fix incorrect scope after an if statement

tools/oxenstored: Fix incorrect scope after an if statement

A debug statement got inserted into a single-expression if statement.

Insert brackets to give the intended meaning, rather than the actual meaning
where the "let con = Connections..." is outside and executed unconditionally.

This results in some unnecessary ring checks for domains which otherwise have
IO credit.

Fixes: 42f0581a91d4 ("tools/oxenstored: Implement live update for socket connections")
Reported-by: Edwin Török <edvin.torok@citrix.com>
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Christian Lindig <christian.lindig@citrix.com>
(cherry picked from commit ee36179371fd4215a43fb179be2165f65c1cd1cd)