try to fix CI error

https://github.com/scottlamb/retina/actions/runs/1148367482

.github/workflows/ci.yml

@@ -39,9 +39,11 @@ jobs:
       run: cargo test --all-features
     - name: Check fuzz tests
       run: cd fuzz && cargo check
-    - name: Check formatting
+    - name: Check main crate formatting
       if: matrix.rust == 'stable'
       run: cargo fmt -- --check
+    - name: Check fuzz crate formatting
+      if: matrix.rust == 'stable'
       run: cd fuzz && cargo fmt -- --check
   license:
     name: Check copyright/license headers