Clean up clippy allows and unnecessary borrows (#1571) #596

Job	Run time
nostd/thumbv6m-none-eabi/stable	19s
Pass MSRV values to other jobs	3s
clippy/stable	20s
cargo-careful	1m 37s
format/nightly	14s
miri	10m 37s
docs/nightly	22s
cross_test/i686-unknown-linux-gnu/stable	2m 4s
cross_test/s390x-unknown-linux-gnu/stable	8m 13s
blas-msrv	42s
tests/1.64.0	3m 21s
tests/nightly	2m 36s
tests/stable	2m 22s
tests/beta	2m 22s
conclusion	3s
	35m 15s

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