Fix 14994: False negative: `nullPointer` with `getenv` #20733

Job	Run time
build_make (alpine:3.23)	5m 13s
build_cmake (alpine:3.23, false, false)	3m 47s
build_make (ubuntu:25.10)	3m 30s
build_make (ubuntu:24.04)	3m 47s
build_cmake (ubuntu:25.10, true, true)	6m 16s
build_cmake (ubuntu:24.04, true, true)	3m 29s
	26m 2s

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