Fix some "error value not checked" linter warnings

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

examples/journal/main.go

@@ -29,7 +29,7 @@ func main() {
 
 	if ok {
 		// use journal native protocol
-		journal.Send("this is a message logged through the native protocol", journal.PriInfo, nil)
+		_ = journal.Send("this is a message logged through the native protocol", journal.PriInfo, nil)
 	} else {
 		// use stderr
 		fmt.Fprintln(os.Stderr, "this is a message logged through stderr")

journal/journal_unix.go

@@ -193,7 +193,7 @@ func appendVariable(w io.Writer, name, value string) {
 		 * - the data, followed by a newline
 		 */
 		fmt.Fprintln(w, name)
-		binary.Write(w, binary.LittleEndian, uint64(len(value)))
+		_ = binary.Write(w, binary.LittleEndian, uint64(len(value)))
 		fmt.Fprintln(w, value)
 	} else {
 		/* just write the variable and value all on one line */

journal/journal_unix_test.go

@@ -135,7 +135,7 @@ func ExampleStderrIsJournalStream() {
 
 	if ok {
 		// use journal native protocol
-		journal.Send("this is a message logged through the native protocol", journal.PriInfo, nil)
+		_ = journal.Send("this is a message logged through the native protocol", journal.PriInfo, nil)
 	} else {
 		// use stderr
 		fmt.Fprintln(os.Stderr, "this is a message logged through stderr")

sdjournal/journal_test.go

@@ -126,7 +126,10 @@ func TestJournalWait(t *testing.T) {
 		t.Errorf("Wait did not wait 300ms. Actually waited %s", duration.String())
 	}
 
-	journal.Send("test message", journal.PriInfo, map[string]string{"TEST": "TestJournalWait " + id})
+	err := journal.Send("test message", journal.PriInfo, map[string]string{"TEST": "TestJournalWait " + id})
+	if err != nil {
+		t.Fatal(err)
+	}
 	for ret := -1; ret != SD_JOURNAL_APPEND; {
 		t1 = time.Now()
 		ret = j.Wait(time.Millisecond * 300)

unit/deserialize.go

@@ -38,10 +38,8 @@ const (
 	SYSTEMD_NEWLINE = "\r\n"
 )
 
-var (
-	// ErrLineTooLong gets returned when a line is too long for systemd to handle.
-	ErrLineTooLong = fmt.Errorf("line too long (max %d bytes)", SYSTEMD_LINE_MAX)
-)
+// ErrLineTooLong gets returned when a line is too long for systemd to handle.
+var ErrLineTooLong = fmt.Errorf("line too long (max %d bytes)", SYSTEMD_LINE_MAX)
 
 // DeserializeOptions parses a systemd unit file into a list of UnitOptions
 func DeserializeOptions(f io.Reader) (opts []*UnitOption, err error) {
@@ -79,7 +77,6 @@ type lexData struct {
 
 // deserializeAll deserializes into UnitSections and UnitOptions.
 func deserializeAll(f io.Reader) ([]*UnitSection, []*UnitOption, error) {
-
 	lexer, lexchan, errchan := newLexer(f)
 
 	go lexer.lex()
@@ -255,7 +252,7 @@ func (l *lexer) lexNextSectionOrOptionFunc(section string) lexStep {
 			return l.ignoreLineFunc(l.lexNextSectionOrOptionFunc(section)), nil
 		}
 
-		l.buf.UnreadRune()
+		_ = l.buf.UnreadRune() // This can't fail as we just called ReadRune.
 		return l.lexOptionNameFunc(section), nil
 	}
 }