Do not flag the unhandled errors which are explicitly ignored

fixes #270

Author: ccojocar

rules/errors.go

@@ -51,18 +51,6 @@ func returnsError(callExpr *ast.CallExpr, ctx *gosec.Context) int {
 
 func (r *noErrorCheck) Match(n ast.Node, ctx *gosec.Context) (*gosec.Issue, error) {
 	switch stmt := n.(type) {
-	case *ast.AssignStmt:
-		for _, expr := range stmt.Rhs {
-			if callExpr, ok := expr.(*ast.CallExpr); ok && r.whitelist.ContainsCallExpr(expr, ctx, false) == nil {
-				pos := returnsError(callExpr, ctx)
-				if pos < 0 || pos >= len(stmt.Lhs) {
-					return nil, nil
-				}
-				if id, ok := stmt.Lhs[pos].(*ast.Ident); ok && id.Name == "_" {
-					return gosec.NewIssue(ctx, n, r.ID(), r.What, r.Severity, r.Confidence), nil
-				}
-			}
-		}
 	case *ast.ExprStmt:
 		if callExpr, ok := stmt.X.(*ast.CallExpr); ok && r.whitelist.ContainsCallExpr(stmt.X, ctx, false) == nil {
 			pos := returnsError(callExpr, ctx)

testutils/source.go

@@ -184,7 +184,7 @@ func test() (int,error) {
 func main() {
 	v, _ := test()
 	fmt.Println(v)
-}`}, 1}, {[]string{`
+}`}, 0}, {[]string{`
 package main
 import (
 	"io/ioutil"
@@ -206,7 +206,7 @@ func main() {
 	a()
 	b()
 	c()
-}`}, 3}, {[]string{`
+}`}, 2}, {[]string{`
 package main
 import "fmt"
 func test() error {