fix(golang): Check error of xml Encode (#3027)

mcristina422 · wing328 · commit a2e84c348cb7 · 2019-05-31T00:50:34.000+08:00
diff --git a/modules/openapi-generator/src/main/resources/go/client.mustache b/modules/openapi-generator/src/main/resources/go/client.mustache
@@ -376,7 +376,7 @@ func setBody(body interface{}, contentType string) (bodyBuf *bytes.Buffer, err e
 	} else if jsonCheck.MatchString(contentType) {
 		err = json.NewEncoder(bodyBuf).Encode(body)
 	} else if xmlCheck.MatchString(contentType) {
-		xml.NewEncoder(bodyBuf).Encode(body)
+		err = xml.NewEncoder(bodyBuf).Encode(body)
 	}
 
 	if err != nil {
diff --git a/samples/client/petstore/go/go-petstore/client.go b/samples/client/petstore/go/go-petstore/client.go
@@ -387,7 +387,7 @@ func setBody(body interface{}, contentType string) (bodyBuf *bytes.Buffer, err e
 	} else if jsonCheck.MatchString(contentType) {
 		err = json.NewEncoder(bodyBuf).Encode(body)
 	} else if xmlCheck.MatchString(contentType) {
-		xml.NewEncoder(bodyBuf).Encode(body)
+		err = xml.NewEncoder(bodyBuf).Encode(body)
 	}
 
 	if err != nil {

Original file line number	Diff line number	Diff line change
`@@ -376,7 +376,7 @@ func setBody(body interface{}, contentType string) (bodyBuf *bytes.Buffer, err e`
`376`	`376`	`} else if jsonCheck.MatchString(contentType) {`
`377`	`377`	`err = json.NewEncoder(bodyBuf).Encode(body)`
`378`	`378`	`} else if xmlCheck.MatchString(contentType) {`
`379`		`- xml.NewEncoder(bodyBuf).Encode(body)`
	`379`	`+ err = xml.NewEncoder(bodyBuf).Encode(body)`
`380`	`380`	`}`
`381`	`381`
`382`	`382`	`if err != nil {`
Original file line number	Diff line number	Diff line change
`@@ -387,7 +387,7 @@ func setBody(body interface{}, contentType string) (bodyBuf *bytes.Buffer, err e`
`387`	`387`	`} else if jsonCheck.MatchString(contentType) {`
`388`	`388`	`err = json.NewEncoder(bodyBuf).Encode(body)`
`389`	`389`	`} else if xmlCheck.MatchString(contentType) {`
`390`		`- xml.NewEncoder(bodyBuf).Encode(body)`
	`390`	`+ err = xml.NewEncoder(bodyBuf).Encode(body)`
`391`	`391`	`}`
`392`	`392`
`393`	`393`	`if err != nil {`