Remove an unnecessary else #530

Job	Run time
loom	2m 28s
minrust	2m 23s
miri	8m 10s
cross (i686-unknown-linux-gnu)	25s
cross (armv7-unknown-linux-gnueabihf)	27s
nightly	3m 27s
cross (powerpc-unknown-linux-gnu)	30s
rustfmt	3s
stable (ubuntu-latest)	1m 20s
cross (powerpc64-unknown-linux-gnu)	36s
stable (macos-latest)	1m 54s
tsan	2m 45s
cross (wasm32-unknown-unknown)	7s
stable (windows-latest)	2m 19s
Publish Documentation	2m 8s
	29m 2s

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