ls: Only skip directory nodes

Special case for Walk(): When SkipDir is returned for a non-dir node,
the remaining nodes for the current tree are skipped. We don't want
that.

cmd/restic/cmd_ls.go

@@ -125,9 +125,17 @@ func runLs(opts LsOptions, gopts GlobalOptions, args []string) error {
 					}
 				}
 				if !walk {
+					if node.Type == "dir" {
+						// signal Walk() that it should not descend into the tree.
 						return false, walker.SkipNode
 					}
 
+					// we must not return SkipNode for non-dir nodes because
+					// then the remaining nodes in the same tree would be
+					// skipped, so return nil instead
+					return false, nil
+				}
+
 				// this second iteration ensures that we get an exact match
 				// according to the filter and whether we should match subfolders
 				var match bool