lmp: fix evflag initialization #4484

Job	Run time
Build source distribution	23s
determine-arm64-runner	1s
Build wheels for cp311-manylinux_x86_64	5m 28s
Build wheels for cp311-manylinux_x86_64	5m 8s
Build wheels for cp311-macosx_x86_64	6m 33s
Build wheels for cp311-macosx_arm64	5m 43s
Build wheels for cp311-win_amd64	6m 21s
Build wheels for cp310-manylinux_aarch64	4m 15s
build_pypi_index	6s
build_docker (12)	2m 36s
upload_pypi	0s
build_docker (_cu11, 11)	2m 44s
deploy_pypi_index	0s
Pass testing build wheels	2s
	39m 20s

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