Remove unreachable else branch (#661) #544

Job	Run time
loom	2m 47s
miri	7m 41s
minrust	2m 51s
cross (i686-unknown-linux-gnu)	36s
cross (armv7-unknown-linux-gnueabihf)	27s
nightly	3m 44s
rustfmt	9s
cross (powerpc-unknown-linux-gnu)	30s
stable (ubuntu-latest)	1m 9s
cross (powerpc64-unknown-linux-gnu)	30s
stable (macos-latest)	2m 9s
tsan	3m 4s
cross (wasm32-unknown-unknown)	6s
stable (windows-latest)	3m 3s
Publish Documentation	2m 32s
	31m 18s

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