mount: rm unneeded errorlint annotation

golangci-lint v1.54.2 comes with errorlint v1.4.4, which contains
the fix [1] whitelisting all errno comparisons for errors coming from
x/sys/unix. Remove the annotation that is no longer needed.

Unfortunately, switch on a bare unix error (in mountinfo) still needs to
be annotated (see [2]).

[1] polyfloyd/go-errorlint#47
[2] polyfloyd/go-errorlint#54

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

mount/mount_unix.go

@@ -23,7 +23,7 @@ func Mount(device, target, mType, options string) error {
 // a normal unmount. If target is not a mount point, no error is returned.
 func Unmount(target string) error {
 	err := unix.Unmount(target, mntDetach)
-	if err == nil || err == unix.EINVAL { //nolint:errorlint // unix errors are bare
+	if err == nil || err == unix.EINVAL {
 		// Ignore "not mounted" error here. Note the same error
 		// can be returned if flags are invalid, so this code
 		// assumes that the flags value is always correct.