lmp: fix evflag initialization (#3133) #4487

Job	Run time
determine-arm64-runner	1s
Build source distribution	18s
Build wheels for cp311-manylinux_x86_64	5m 14s
Build wheels for cp311-manylinux_x86_64	5m 10s
Build wheels for cp311-macosx_x86_64	8m 2s
Build wheels for cp311-macosx_arm64	7m 42s
Build wheels for cp311-win_amd64	5m 2s
Build wheels for cp310-manylinux_aarch64	4m 21s
build_pypi_index	11s
build_docker (12)	6m 52s
build_docker (_cu11, 11)	8m 22s
upload_pypi	0s
deploy_pypi_index	7s
Pass testing build wheels	4s
	51m 26s

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