Fix uninit-17.c (PR44738)

[Bernd Schmidt]

Whatever was causing this testcase to behave differently on i686 than on
all other targets seems to have been fixed.  There remains the problem
that we're emitting an unnecessary message, which I think can be fixed
with the change in warn_uninit.

Testing in progress (will test i686 and x86_64).  Ok?


Bernd
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