[Chicken-janitors] #360: remove scrutinizer warning about conditional tests that are always true

[Chicken Trac]

#360: remove scrutinizer warning about conditional tests that are always true
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 Reporter:  felix        |       Owner:  felix
     Type:  task         |      Status:  new  
 Priority:  minor        |   Milestone:  4.7.0
Component:  compiler     |     Version:  4.6.x
 Keywords:  scrutinizer  |  
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 Things like `and-let*` produce situations where such redundant tests
 occur, for example.

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Ticket URL: <https://bugs.call-cc.org/ticket/360>
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