Fix clang-format args

Looks like clang-format in Ubuntu does not recognize glob pattern as
macOS does. Previous solution without xargs reported status code of
find itself, not clang-format.

.github/workflows/ci-build.yml

@@ -41,7 +41,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: clang-format
-        run: clang-format --dry-run --Werror src/**/*.cc src/**/*.h
+        run: find src -type f -name \*.cc -o -name \*.h | xargs clang-format --dry-run --Werror
 
   android:
     name: Android