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Shifting large rcode in dns/message.c results in undefined behaviour

Found by a combination of UBSAN and AFL++...

message.c:2274:33: runtime error: left shift of 2048 by 20 places cannot be represented in type 'int'
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior message.c:2274:33 in

It's mostly harmless, but should be fixed nevertheless.

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