Merge pull request #84 from sbezverk/error_wrap

Replace %v with %w to wrap netlink error

.travis.yml

@@ -5,14 +5,14 @@ dist: trusty
 
 language: go
 go:
-  - "1.10"
+  - "1.13"
 
 script:
   # Check whether files are syntactically correct.
   - "gofmt -l $(find . -name '*.go' | tr '\\n' ' ') >/dev/null"
   # Check whether files were not gofmt'ed.
   - "gosrc=$(find . -name '*.go' | tr '\\n' ' '); [ $(gofmt -l $gosrc 2>&- | wc -l) -eq 0 ] || (echo 'gofmt was not run on these files:'; gofmt -l $gosrc 2>&-; false)"
-  - go tool vet .
+  - go vet .
   - go test ./...
   - go test -c github.com/google/nftables
   - sudo ./nftables.test -test.v -run_system_tests

conn.go

@@ -57,11 +57,11 @@ func (cc *Conn) Flush() error {
 	defer conn.Close()
 
 	if _, err := conn.SendMessages(batch(cc.messages)); err != nil {
-		return fmt.Errorf("SendMessages: %v", err)
+		return fmt.Errorf("SendMessages: %w", err)
 	}
 
 	if _, err := conn.Receive(); err != nil {
-		return fmt.Errorf("Receive: %v", err)
+		return fmt.Errorf("Receive: %w", err)
 	}
 
 	cc.messages = nil