test: Fix non-dirty files being reported as dirty

Fixes non-dirty files being reported as dirty.

Since the `is_dirty` variable was initialized as 0 outside the for loop,
after a dirty file was found, all the subsequent files were also
reported as dirty. Initializing it in the every iteration fixes this
issue.

Signed-off-by: Takahiro Itazuri <[email protected]>

Author: zulinx86

.github/workflows/deny_dirty_cargo_locks.yml

@@ -14,10 +14,10 @@ jobs:
       - name: "Check no Cargo.lock files are dirty"
         run: |
           exit_code=0
-          is_dirty=0
           # This breaks for paths with whitespaces in them, but we have an integration test
           # that prevents those from existing in this repository.
           for f in $(find . -name 'Cargo.lock' -not -path "./build/*"); do
+            is_dirty=0
             (
               cd "$(dirname "$f")"
               cargo --locked metadata --format-version 1 >/dev/null 2>&1