Resolve C4702 unreachable code warnings (fixes #4280) #7757

Job	Run time
mingw (mingw64)	4m 3s
mingw (ucrt64)	4m 14s
build (windows-2019, Win32, v142, 17, Debug)	1m 27s
build (windows-2019, Win32, v142, 17, Release)	2m 14s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 26s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 44s
build (windows-2019, x64, v141, 14, Debug)	1m 57s
build (windows-2019, x64, v141, 14, Release)	2m 57s
build (windows-2019, x64, v141, 17, Debug)	1m 35s
build (windows-2019, x64, v141, 17, Release)	2m 11s
build (windows-2019, x64, v142, 17, Debug)	1m 37s
build (windows-2019, x64, v142, 17, Release)	2m 33s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 21s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	1m 58s
build (windows-2019, x64, v142, 20, Debug)	1m 54s
build (windows-2019, x64, v142, 20, Release)	3m 10s
build (windows-2022, x64, v143, Debug, 20)	1m 33s
	38m 54s

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