Return non-zero status when errors occur.

Clean all was not returning non-zero when an error occur (like when
failing to remove a directory). This patch fix the problem and add a test
for it.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/test.h b/src/test.h
index 0af8874..c516508 100644
--- a/src/test.h
+++ b/src/test.h
@@ -45,7 +45,7 @@ struct VirtualFileSystem : public DiskInterface {
   virtual int Stat(const string& path);
   virtual bool MakeDir(const string& path);
   virtual string ReadFile(const string& path, string* err);
-  virtual bool RemoveFile(const string& path);
+  virtual int RemoveFile(const string& path);
 
   /// An entry for a single in-memory file.
   struct Entry {