crypto: fix argument validation in crypto.timingSafeEqual fast path #591

Job	Run time
Build slim tarball	1m 29s
aarch64-linux: with shared libraries	23m 45s
x86_64-darwin: with shared libraries	48m 51s
x86_64-linux: with shared libraries	28m 14s
aarch64-darwin: with shared libraries	29m 16s
	2h 11m 35s

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