tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues fou

tests: make the unit test result type `CURLcode`

Before this patch, the result code was a mixture of `int` and
`CURLcode`.

Also adjust casts and fix a couple of minor issues found along the way.

Cherry-picked from #13489
Closes #13600

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aws_sigv4: fall back to UNSIGNED-PAYLOAD for sign_as_s3

all s3 requests default to UNSIGNED-PAYLOAD and add the required
x-amz-content-sha256 header. this allows CURLAUTH_AWS_SIGV4 to co

aws_sigv4: fall back to UNSIGNED-PAYLOAD for sign_as_s3

all s3 requests default to UNSIGNED-PAYLOAD and add the required
x-amz-content-sha256 header. this allows CURLAUTH_AWS_SIGV4 to correctly
sign s3 requests to amazon with no additional configuration

Signed-off-by: Casey Bodley <cbodley@redhat.com>

Closes #9995

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