Remove nolint annotations for unix errno comparisons

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.

Thus, these annotations are no longer necessary. Hooray!

[1] https://github.com/polyfloyd/go-errorlint/pull/47
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/specconv/spec_linux.go

@@ -322,7 +322,6 @@ type CreateOpts struct {
 func getwd() (wd string, err error) {
 	for {
 		wd, err = unix.Getwd()
-		//nolint:errorlint // unix errors are bare
 		if err != unix.EINTR {
 			break
 		}