Unused callback #1116

Job	Run time
macOS [UBSAN] [lmdb \| clang]	52m 42s
Linux [UBSAN] [lmdb \| clang]	40m 49s
macOS [ASAN] [lmdb \| clang]	24m 18s
Linux [ASAN] [lmdb \| clang]	41m 10s
macOS [TSAN] [lmdb \| clang] (Errors Ignored)	1h 5m 18s
macOS [UBSAN] [rocksdb \| clang]	36m 17s
Linux [ASAN_INT] [lmdb \| clang] (Errors Ignored)	39m 24s
macOS [ASAN] [rocksdb \| clang]	31m 41s
Linux [TSAN] [lmdb \| clang] (Errors Ignored)	38m 2s
macOS [TSAN] [rocksdb \| clang] (Errors Ignored)	47m 43s
Linux [LEAK] [lmdb \| clang] (Errors Ignored)	39m 59s
Linux [UBSAN] [rocksdb \| clang]	45m 23s
Linux [ASAN] [rocksdb \| clang]	51m 50s
Linux [ASAN_INT] [rocksdb \| clang] (Errors Ignored)	50m 40s
Linux [TSAN] [rocksdb \| clang] (Errors Ignored)	1h 33m 15s
Linux [LEAK] [rocksdb \| clang] (Errors Ignored)	47m 9s
	12h 25m 40s

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