Extend CI checks

This patch adds clippy and rustfmt to the CI and fails the workflow if
cargo doc shows a warning.

.github/workflows/ci.yml

@@ -39,11 +39,19 @@ jobs:
       - name: Build
         run: cargo build --release --verbose
 
+      - name: Run clippy
+        if: matrix.target == 'x86_64-unknown-linux-gnu'
+        run: cargo clippy --all-features --all-targets -- --deny warnings
+
+      - name: Check code format
+        if: matrix.target == 'x86_64-unknown-linux-gnu'
+        run: cargo fmt -- --check
+
       - name: Run tests
         if: matrix.target == 'x86_64-unknown-linux-gnu'
         run: >
           cargo test &&
           cargo test --release
 
-      - name: Build Documentation
-        run: cargo doc --no-deps
+      - name: Check documentation
+        run: RUSTDOCFLAGS="-D warnings" cargo doc --no-deps 

src/tests.rs

@@ -474,7 +474,7 @@ fn test_iter_dirs() {
     let mut storage = RamStorage::new(&mut backend);
     Filesystem::format(&mut storage).unwrap();
     Filesystem::mount_and_then(&mut storage, |fs| {
-        fs.create_dir(path!("/tmp").into())?;
+        fs.create_dir(path!("/tmp"))?;
 
         // TODO: we might want "multi-open"
         fs.create_file_and_then(path!("/tmp/file.a"), |file| {