[nit] Move cnt definition to the branch it's used in. (#1683) #874

Job	Run time
Test (stable)	1m 27s
Test (beta)	1m 24s
Coverage	1m 3s
Test (nightly)	1m 14s
Build documentation	1m 22s
Test (1.65.0)	1m 24s
Bench	1m 16s
Test (stable, --features "std")	1m 19s
Test minimal rust version	41s
Test (stable, --no-default-features)	1m 7s
Test (stable, --no-default-features --features "alloc")	1m 22s
Check formatting	6s
Test (nightly, --no-default-features)	1m 13s
Test (nightly, --no-default-features --features "alloc")	1m 10s
	16m 8s

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