test: tweak CI configure

.golangci.yml

@@ -0,0 +1,3 @@
+run:
+  skip-files:
+    - ".*_test.go$"

.travis.yml

@@ -1,12 +1,13 @@
 language: go
 
+go:
+  - 1.12
+
 script:
-  - go test -covermode count -coverprofile coverage.txt -args -alhoc
-after_success:
-  # See https://github.com/codecov/example-go
-  - bash <(curl -s https://codecov.io/bash)
+  - set -e
+  - curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.17.1
+  - ./bin/golangci-lint run ./...
+  -  go test -v -coverprofile cover.out -args -alhoc
 
-go:
-  - 1.6
-  - 1.7
-  - tip
+after_success:
+  - bash <(curl -s https://codecov.io/bash) -f cover.out

suffix.go

@@ -277,7 +277,6 @@ func (node *_Node) longestSuffix(key []byte) (matchedKey []byte, value interface
 					if found {
 						return matchedKey, value, found
 					}
-					break
 				}
 			}
 		} else if keyLen == edgeLabelLen {
@@ -290,7 +289,6 @@ func (node *_Node) longestSuffix(key []byte) (matchedKey []byte, value interface
 					if found {
 						return matchedKey, value, found
 					}
-					break
 				}
 			}
 		} else {
@@ -514,7 +512,7 @@ func (tree *Tree) Walk(f func(key []byte, value interface{}) bool) {
 func (tree *Tree) WalkSuffix(suffix []byte, f func(key []byte, value interface{}) bool) {
 	if len(tree.root.edges) != 0 {
 		stop := false
-		if suffix == nil || len(suffix) == 0 {
+		if len(suffix) == 0 {
 			tree.root.walk([]byte{}, f, &stop)
 		} else {
 			startingPoint, extraLabel, found := tree.root.getPointHasSuffix(suffix)