Initialize queue "last" field
The compiler is not always able to see that "last" is always initialized before being used, so always initialize it.
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@ -13,7 +13,7 @@
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#define queue_init(PQ) \
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#define queue_init(PQ) \
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(void) ((PQ)->first = NULL)
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(void) ((PQ)->first = (PQ)->last = NULL)
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#define queue_is_empty(PQ) \
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#define queue_is_empty(PQ) \
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!(PQ)->first
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!(PQ)->first
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