fix warning #3064

Job	Run time
clang-sanitizers (,thread)	17m 52s
linux-shared-libs	15m 41s
linux-compat (manylinux1-x64)	16m 8s
clang-sanitizers (,address,undefined)	17m 37s
linux-compat (manylinux1-x86)	15m 29s
linux-compat (manylinux2014-x64)	16m 17s
linux-compat (manylinux2014-x86)	15m 12s
byo-crypto	2m 28s
windows	18m 24s
linux-compat (al2-x64)	15m 34s
linux-compiler-compat (clang-3)	15m 11s
linux-compiler-compat (clang-6)	15m 9s
linux-compiler-compat (clang-8)	15m 11s
windows-shared-libs	16m 5s
linux-compiler-compat (clang-9)	15m 11s
windows-vc14 (x86)	14m 31s
linux-compiler-compat (clang-10)	15m 9s
windows-vc14 (x64)	14m 44s
linux-compiler-compat (clang-11)	15m 12s
linux-compiler-compat (gcc-4.8)	14m 53s
linux-compiler-compat (gcc-5)	15m 10s
linux-compiler-compat (gcc-6)	15m 11s
linux-compiler-compat (gcc-7)	15m 9s
downstream	16m 37s
linux-compiler-compat (gcc-8)	15m 12s
linux-debug	15m 45s
osx	18m 26s
windows-app-verifier	5m 29s
	6h 58m 57s

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