Mir: fixup nits in previous commit (f536143)
Mir: fixup nits in previous commit (f536143)

As suggested by arielb1.

Closes rust-lang/rust#18510

Signed-off-by: David Henningsson <9ae66a7c420ac43dafc6e60221abac36e5a3336a@ubuntu.com>

GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,GBGamer/rust