Remove accidentially slipped-in println

lib/core/libimagstore/src/store.rs

@@ -817,7 +817,6 @@ impl Store {
                     let is_file = {
                         let mut base = self.path().clone();
                         base.push(element.clone());
-                        println!("Checking: {:?}", base);
                         try!(self.backend.is_file(&base))
                     };