filesystem: fix windows directory iteration

filesystem.hpp

@@ -108,6 +108,12 @@ public:
         return dir_path.c_str();
     }
 
+#ifdef _WIN32
+    const char_t *validPath() const {
+        return dir_path.substr(0, dir_path.length()-2).c_str();
+    }
+#endif
+
 private:
     string dir_path;
 };

windows/filesystem.cpp

@@ -10,7 +10,7 @@ FSLib::Directory::Directory( const string &path_ ) : dir_path( path_ ) {
 }
 
 FSLib::Directory::Iterator::Iterator( const Directory &d_ ) {
-    if ( !exists( d_.path() ) || !isDirectory( d_.path() ) ) {
+    if ( !exists( d_.validPath() ) || !isDirectory( d_.validPath() ) ) {
         throw std::runtime_error(
             "Directory either doesn't exist or isn't a directory" );
     }