Add missing braces #1498

Job	Run time
linux-nanovdb:cxx:g++-Release	7m 43s
linux-nanovdb:cxx:g++-Debug	6m 7s
linux-nanovdb:cxx:clang++-Release	7m 54s
linux-nanovdb:cxx:clang++-Debug	5m 38s
nanovdb-lite	1m 42s
macos-nanovdb (macos-11, clang++, Release)	14m 47s
macos-nanovdb (macos-11, clang++, Debug)	9m 2s
windows-nanovdb (x64-windows-static, Release, -A x64 -G \"Visual Studio 17 2022\" -DOPENVDB_CORE_...	21m 31s
windows-nanovdb (x64-windows-static, Debug, -A x64 -G \"Visual Studio 17 2022\" -DOPENVDB_CORE_SH...	25m 24s
windows-nanovdb (x64-windows, Release, -A x64 -G \"Visual Studio 17 2022\" -DOPENVDB_CORE_STATIC=...	23m 3s
windows-nanovdb (x64-windows, Debug, -A x64 -G \"Visual Studio 17 2022\" -DOPENVDB_CORE_STATIC=OFF)	9m 15s
	2h 12m 6s

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