messy static_assert error message

[foxhlchen]

When static_assert assertion is not satisfied, the error output is a bit messy.

for example:

static_assert!(1 == 2);

error: any use of this value will cause an error
   --> rust/kernel/static_assert.rs:36:23
    |
36  |         const _: () = [()][!($condition) as usize];
    |         --------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^-
    |                       |
    |                       index out of bounds: the length is 1 but the index is 1
    |
   ::: rust/kernel/error.rs:114:9
    |
114 |         static_assert!(1==2);
    |         --------------------- in this macro invocation
    |
    = note: `#[deny(const_err)]` on by default
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #71800 <https://github.com/rust-lang/rust/issues/71800>
    = note: this error originates in the macro `static_assert` (in Nightly builds, run with -Z macro-backtrace for more info)

Can we make it more clear??

[nbdd0121]

Duplicate of #274

[foxhlchen]

Duplicate of #274

Ok