pkg: fix incorrect prints found by govet

R=golang-dev, nigeltao
CC=golang-dev
https://golang.org/cl/5266041

src/pkg/exp/sql/fakedb_test.go

@@ -145,7 +145,7 @@ func (db *fakeDB) createTable(name string, columnNames, columnTypes []string) os
 	}
 	if len(columnNames) != len(columnTypes) {
 		return fmt.Errorf("create table of %q len(names) != len(types): %d vs %d",
-			len(columnNames), len(columnTypes))
+			name, len(columnNames), len(columnTypes))
 	}
 	db.tables[name] = &table{colname: columnNames, coltype: columnTypes}
 	return nil

src/pkg/exp/sql/sql_test.go

@@ -85,7 +85,7 @@ func TestStatementQueryRow(t *testing.T) {
 		if err := stmt.QueryRow(tt.name).Scan(&age); err != nil {
 			t.Errorf("%d: on %q, QueryRow/Scan: %v", n, tt.name, err)
 		} else if age != tt.want {
-			t.Errorf("%d: age=%d, want %d", age, tt.want)
+			t.Errorf("%d: age=%d, want %d", n, age, tt.want)
 		}
 	}
 

src/pkg/exp/template/html/escape_test.go

@@ -1570,7 +1570,7 @@ func TestEscapeErrorsNotIgnorable(t *testing.T) {
 func TestEscapeSetErrorsNotIgnorable(t *testing.T) {
 	s, err := (&template.Set{}).Parse(`{{define "t"}}<a{{end}}`)
 	if err != nil {
-		t.Error("failed to parse set: %q", err)
+		t.Errorf("failed to parse set: %q", err)
 	}
 	EscapeSet(s, "t")
 	var b bytes.Buffer

src/pkg/template/exec_test.go

@@ -532,7 +532,7 @@ func TestDelims(t *testing.T) {
 			t.Fatalf("delim %q exec err %s", left, err)
 		}
 		if b.String() != hello+trueLeft {
-			t.Error("expected %q got %q", hello+trueLeft, b.String())
+			t.Errorf("expected %q got %q", hello+trueLeft, b.String())
 		}
 	}
 }