Use zero-cost method to construct `Error`s#335

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TheSven73 wants to merge 3 commits intoRust-for-Linux:rustfrom

TheSven73:rust-for-linux-error-invariant

Commits on Jun 4, 2021

rust/kernel: introduce zero-cost `from_kernel_int_result()`
Sven Van Asbroeck
committed
rust/kernel: introduce zero-cost `from_kernel_int_result_uint()`
Sven Van Asbroeck
committed
rust/kernel: remove `Error::from_kernel_errno()` dead code warning
Sven Van Asbroeck
committed