makes wsfs_status public (usable in provider example)

include/wsfs/provider/operation/error.h

@@ -2,6 +2,7 @@
 #define WSFSP_OPERATION_ERROR_H
 
 #include "wsfs/provider/api.h"
+#include "wsfs/status.h"
 
 struct wsfsp_request;
 
@@ -12,7 +13,7 @@ extern "C"
 
 extern WSFSP_API void wsfsp_respond_error(
     struct wsfsp_request * request,
-    int status);
+    wsfs_status status);
 
 #ifdef __cplusplus
 }