Fix: clippy warning in rust 1.62.1

[dlhxzb]

Just resolve warnings in cargo clippy and build

$ rustc -V rustc 1.62.1 (e092d0b6b 2022-07-16)

@rustdesk PTAL

[paspo]

I just tried and every warning seems solved. Just remember a touch of cargo fmt.

FYI on rust versions:

• ubuntu 20.04 uses rust 1.59.0
• ubuntu 22.04 uses rust 1.59.0
• our automatic build (via github actions) is ubuntu-22.04

So this is not urgent, but it's welcome.

LGTM

[dlhxzb]

Of course I had ran cargo fmt

[paspo]

our automatic build (via github actions) is ubuntu-22.04

which now uses rust 1.62.1, as stated here

Now this PR is gaining priority.

[paspo]

@rustdesk PTAL

[rustdesk]

@dlhxzb sorry for ignoring this PR and introduced some conflicts. Could you help solve the conflicts?

[dlhxzb]

Solved & update to 1.66.0

[rustdesk]

Great job!

[rustdesk]

@dlhxzb Thank you so much! do you have interest to fix clippy in rustdesk repo? We can do it part by part.

[dlhxzb]

@rustdesk I will join a new company next month, so maybe a bit busy recently. I will do it if I have time

[rustdesk]

@dlhxzb Congratulations and Thanks. Take time, :)