eio_monitor: fix memory leak issue

Summary:
@fix

Signed-off-by: Vivek Ellur <vivek.ellur@samsung.com>

Reviewers: cedric

Reviewed By: cedric

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D3161

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>

src/lib/eio/eio_monitor_cocoa.c

@@ -330,6 +330,8 @@ void eio_monitor_backend_add(Eio_Monitor *monitor)
 
    if (!_stream)
      {
+        free(monitor_path);
+        free(backend);
         eio_monitor_fallback_add(monitor);
         return;
      }