unhandled-error: use full function name in error message (#962)

* update tests

* Update testdata/unhandled-error-w-ignorelist.go

* Update testdata/unhandled-error-w-ignorelist.go

---------

Co-authored-by: Denis Voytyuk <[email protected]>

Author: mmcloughlin

rule/unhandled-error.go

@@ -119,7 +119,7 @@ func (w *lintUnhandledErrors) addFailure(n *ast.CallExpr) {
 		Category:   "bad practice",
 		Confidence: 1,
 		Node:       n,
-		Failure:    fmt.Sprintf("Unhandled error in call to function %v", gofmt(n.Fun)),
+		Failure:    fmt.Sprintf("Unhandled error in call to function %v", name),
 	})
 }
 

testdata/unhandled-error-w-ignorelist.go

@@ -56,7 +56,7 @@ func testCase4() {
 	b1.Write(nil) // ignore
 	b2.Write(nil) // ignore
 
-	b2.Read([]byte("bytes")) // MATCH /Unhandled error in call to function b2.Read/
+	b2.Read([]byte("bytes")) // MATCH /Unhandled error in call to function bytes.Buffer.Read/
 }
 
 type unhandledErrorStruct1 struct {
@@ -81,9 +81,9 @@ func testCase5() {
 	// fixtures\.unhandledErrorStruct2\.reterr
 	s1 := unhandledErrorStruct1{}
 	_ = s1.reterr()
-	s1.reterr() // MATCH /Unhandled error in call to function s1.reterr/
+	s1.reterr() // MATCH /Unhandled error in call to function fixtures.unhandledErrorStruct1.reterr/
 
 	s2 := unhandledErrorStruct2{}
 	s2.reterr()  // ignore
-	s2.reterr1() // MATCH /Unhandled error in call to function s2.reterr1/
+	s2.reterr1() // MATCH /Unhandled error in call to function fixtures.unhandledErrorStruct2.reterr1/
 }