Fails to build since clippy fixes

[Scrumplex]

Since commit 9f11a7e, compiling fails on rustc 1.65.0-nightly (29e4a9ee0 2022-08-10) for me.

See:

error: cannot find macro `error` in this scope
  --> layer_core/src/wrappers/swapchain.rs:71:25
   |
71 |                         error!(
   |                         ^^^^^
   |
   = note: consider importing this macro:
           log::error

error: could not compile `layer_core` due to previous error

the mentioned import was removed by the commit above