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nat_traversal: declare flag literal as unsigned

- GH #2954

Daniel-Constantin Mierla authored on 27/11/2021 14:24:45
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@@ -85,7 +85,7 @@ MODULE_VERSION
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 /* WARNING: Keep this aligned with parser/msg_parser.h! */
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-#define FL_DO_KEEPALIVE (1 << 31)
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+#define FL_DO_KEEPALIVE (1u << 31)
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 #define HASH_SIZE 512
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