Merge branch 'issue-7311' of https://github.com/ffddorf/swagger-codegen into ffddorf-issue-7311

# Conflicts:
#	modules/swagger-codegen/src/main/resources/go/api.mustache

Author: HugoMario

modules/swagger-codegen/src/main/resources/go/api.mustache

@@ -149,8 +149,11 @@ func (a *{{{classname}}}Service) {{{nickname}}}(ctx context.Context{{#hasParams}
 {{#hasFormParams}}
 {{#formParams}}
 {{#isFile}}
-	var localVarFile {{dataType}}
+{{#required}}
+    localVarFile := {{paramName}}
+{{/required}}
 {{^required}}
+    var localVarFile {{dataType}}
 	if localVarOptionals != nil && localVarOptionals.{{vendorExtensions.x-exportParamName}}.IsSet() {
 		localVarFileOk := false
 		localVarFile, localVarFileOk = localVarOptionals.{{vendorExtensions.x-exportParamName}}.Value().({{dataType}})