Tests

[📎] Fix clippy #830

Job	Run time
Rustfmt	12s
clippy_check	43s
doc-build	30s
test (x86_64-unknown-linux-gnu)	3m 15s
test-alloc (secp256kfun)	1m 7s
test (armv7-unknown-linux-gnueabihf)	7m 0s
test-alloc (sigma_fun)	2m 33s
test-minimal (secp256kfun)	52s
test-minimal (sigma_fun)	2m 32s
test-alloc (ecdsa_fun)	52s
test-minimal (ecdsa_fun)	41s
test-alloc (schnorr_fun)	54s
build	37s
test-minimal (schnorr_fun)	58s
test-nightly	1m 44s
	24m 30s

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