golangci-lint: fix issues found by gosimple

Everything except the

	if err2.Err == syscall.EOPNOTSUPP

case. Gets too confusing when collapsed into a single line.

Issues were:

$ golangci-lint run --disable-all --enable gosimple
mount.go:473:2: S1008: should use 'return strings.HasPrefix(v, "fusermount version")' instead of 'if strings.HasPrefix(v, "fusermount version") { return true }; return false' (gosimple)
	if strings.HasPrefix(v, "fusermount version") {
	^
cli_args.go:258:5: S1002: should omit comparison to bool constant, can be simplified to `args.forcedecode` (gosimple)
	if args.forcedecode == true {
	   ^
cli_args.go:263:6: S1002: should omit comparison to bool constant, can be simplified to `args.aessiv` (gosimple)
		if args.aessiv == true {
		   ^
cli_args.go:267:6: S1002: should omit comparison to bool constant, can be simplified to `args.reverse` (gosimple)
		if args.reverse == true {
		   ^
internal/stupidgcm/stupidgcm.go:227:6: S1002: should omit comparison to bool constant, can be simplified to `g.forceDecode` (gosimple)
		if g.forceDecode == true {
		   ^
gocryptfs-xray/xray_tests/xray_test.go:23:5: S1004: should use !bytes.Equal(out, expected) instead (gosimple)
	if bytes.Compare(out, expected) != 0 {
	   ^
gocryptfs-xray/xray_tests/xray_test.go:40:5: S1004: should use !bytes.Equal(out, expected) instead (gosimple)
	if bytes.Compare(out, expected) != 0 {
	   ^
gocryptfs-xray/paths_ctlsock.go:34:20: S1002: should omit comparison to bool constant, can be simplified to `!eof` (gosimple)
	for eof := false; eof == false; line++ {
	                  ^
tests/reverse/xattr_test.go:19:2: S1008: should use 'return err2.Err != syscall.EOPNOTSUPP' instead of 'if err2.Err == syscall.EOPNOTSUPP { return false }; return true' (gosimple)
	if err2.Err == syscall.EOPNOTSUPP {
	^
internal/fusefrontend/node.go:459:45: S1002: should omit comparison to bool constant, can be simplified to `!nameFileAlreadyThere` (gosimple)
		if nametransform.IsLongContent(cName2) && nameFileAlreadyThere == false {
		                                          ^
tests/xattr/xattr_integration_test.go:221:2: S1008: should use 'return err2.Err != syscall.EOPNOTSUPP' instead of 'if err2.Err == syscall.EOPNOTSUPP { return false }; return true' (gosimple)
	if err2.Err == syscall.EOPNOTSUPP {
	^
tests/test_helpers/helpers.go:338:19: S1002: should omit comparison to bool constant, can be simplified to `open` (gosimple)
	if err != nil && open == true {
	                 ^
tests/matrix/concurrency_test.go:121:7: S1004: should use !bytes.Equal(buf, content) instead (gosimple)
			if bytes.Compare(buf, content) != 0 {
			   ^

2 files changed, 2 insertions, 2 deletions

diff --git a/tests/matrix/concurrency_test.go b/tests/matrix/concurrency_test.go
index 6a9b9aa..1afd33d 100644
--- a/tests/matrix/concurrency_test.go
+++ b/tests/matrix/concurrency_test.go
@@ -118,7 +118,7 @@ func TestConcurrentReadCreate(t *testing.T) {
 				log.Fatal(err)
 			}
 			buf := buf0[:n]
-			if bytes.Compare(buf, content) != 0 {
+			if !bytes.Equal(buf, content) {
 				// Calling t.Fatal() from a goroutine hangs the test so we use log.Fatal
 				log.Fatalf("%s: content mismatch: have=%q want=%q", t.Name(), string(buf), string(content))
 			}
diff --git a/tests/test_helpers/helpers.go b/tests/test_helpers/helpers.go
index 5bc1298..2a0feb8 100644
--- a/tests/test_helpers/helpers.go
+++ b/tests/test_helpers/helpers.go
@@ -335,7 +335,7 @@ func VerifyExistence(t *testing.T, path string) bool {
 	dir := filepath.Dir(path)
 	name := filepath.Base(path)
 	d, err := os.Open(dir)
-	if err != nil && open == true {
+	if err != nil && open {
 		t.Errorf("VerifyExistence: we can open the file but not the parent dir!? err=%v", err)
 	} else if err == nil {
 		defer d.Close()