Clippy suggests incorrect expression for mul_add

[95th]

clippy suggests incorrect expression:

warning: consider using mul_add() for better numerical precision
  --> src/jarowinkler.rs:68:9
   |
68 |         j + 0.1 * p * (1.0 - j)
   |         ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `0.1 * p.mul_add((1.0 - j), j)`
   |
   = note: `#[warn(clippy::manual_mul_add)]` on by default
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_mul_add

Isn't suggested expression 0.1 * p.mul_add((1.0 - j), j) equivalent to:

0.1 * (p * (1.0 - j) + j)

which is not equivalent to original formula.

Perhaps it should suggest:

(0.1 * p).mul_add((1.0 - j), j)

Additional info:

$ cargo clippy --version
clippy 0.0.212 (8ab24d7 2019-10-24)

[flip1995]

Duplicate of #4735

[flip1995]

We also moved it to nursery, so it is allow-by-default with the next nightly

[95th]

Thanks