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Subject[PATCH 0/8] drop if around WARN_ON
These patches convert a conditional with a simple test expression and a
then branch that only calls WARN_ON(1) to just a call to WARN_ON, which
will test the condition.

// <smpl>
expression e;

if(<+...e(...)...+>) WARN_ON(1);
- if (e) WARN_ON(1);
+ WARN_ON(e);
)// </smpl>

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