Minor cleanups motivated by staticcheck warnings.

process/process_linux.go

@@ -351,7 +351,7 @@ func (p *Process) PageFaultsWithContext(ctx context.Context) (*PageFaultsStat, e
 func (p *Process) ChildrenWithContext(ctx context.Context) ([]*Process, error) {
 	pids, err := common.CallPgrepWithContext(ctx, invoke, p.Pid)
 	if err != nil {
-		if pids == nil || len(pids) == 0 {
+		if len(pids) == 0 {
 			return nil, ErrorNoChildren
 		}
 		return nil, err
@@ -705,10 +705,7 @@ func (p *Process) fillFromCmdlineWithContext(ctx context.Context) (string, error
 		return "", err
 	}
 	ret := strings.FieldsFunc(string(cmdline), func(r rune) bool {
-		if r == '\u0000' {
-			return true
-		}
-		return false
+		return r == '\u0000'
 	})
 
 	return strings.Join(ret, " "), nil

process/process_test.go

@@ -418,14 +418,14 @@ func Test_Process_Exe(t *testing.T) {
 
 func Test_Process_CpuPercent(t *testing.T) {
 	p := testGetProcess()
-	percent, err := p.Percent(0)
+	_, err := p.Percent(0)
 	skipIfNotImplementedErr(t, err)
 	if err != nil {
 		t.Errorf("error %v", err)
 	}
 	duration := time.Duration(1000) * time.Microsecond
 	time.Sleep(duration)
-	percent, err = p.Percent(0)
+	percent, err := p.Percent(0)
 	if err != nil {
 		t.Errorf("error %v", err)
 	}

v3/process/process_linux.go

@@ -351,7 +351,7 @@ func (p *Process) PageFaultsWithContext(ctx context.Context) (*PageFaultsStat, e
 func (p *Process) ChildrenWithContext(ctx context.Context) ([]*Process, error) {
 	pids, err := common.CallPgrepWithContext(ctx, invoke, p.Pid)
 	if err != nil {
-		if pids == nil || len(pids) == 0 {
+		if len(pids) == 0 {
 			return nil, ErrorNoChildren
 		}
 		return nil, err
@@ -678,10 +678,7 @@ func (p *Process) fillFromCmdlineWithContext(ctx context.Context) (string, error
 		return "", err
 	}
 	ret := strings.FieldsFunc(string(cmdline), func(r rune) bool {
-		if r == '\u0000' {
-			return true
-		}
-		return false
+		return r == '\u0000'
 	})
 
 	return strings.Join(ret, " "), nil

v3/process/process_test.go

@@ -420,14 +420,14 @@ func Test_Process_Exe(t *testing.T) {
 
 func Test_Process_CpuPercent(t *testing.T) {
 	p := testGetProcess()
-	percent, err := p.Percent(0)
+	_, err := p.Percent(0)
 	skipIfNotImplementedErr(t, err)
 	if err != nil {
 		t.Errorf("error %v", err)
 	}
 	duration := time.Duration(1000) * time.Microsecond
 	time.Sleep(duration)
-	percent, err = p.Percent(0)
+	percent, err := p.Percent(0)
 	if err != nil {
 		t.Errorf("error %v", err)
 	}