Fix extfs(8) read-only compat mode.

ext/extfs.cpp

@@ -275,7 +275,7 @@ int main(int argc, char* argv[])
 		                "features, falling back to read-only access\n",
 		                device_path);
 		// TODO: Modify the file descriptor such that writing fails!
-		read = true;
+		write = false;
 	}
 
 	// Check whether any features are in use that we can safely disregard.