clean-up "nolint" comments, remove unused ones

- fix "nolint" comments to be in the correct format (`//nolint:<linters>[,<linter>`
  no leading space, required colon (`:`) and linters.
- remove "nolint" comments for errcheck, which is disabled in our config.
- remove "nolint" comments that were no longer needed (nolintlint).
- where known, add a comment describing why a "nolint" was applied.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

oci/utils_unix.go

@@ -127,7 +127,7 @@ func getDevices(path, containerPath string) ([]specs.LinuxDevice, error) {
 
 // TODO consider adding these consts to the OCI runtime-spec.
 const (
-	wildcardDevice = "a" //nolint // currently unused, but should be included when upstreaming to OCI runtime-spec.
+	wildcardDevice = "a" //nolint:deadcode,unused,varcheck // currently unused, but should be included when upstreaming to OCI runtime-spec.
 	blockDevice    = "b"
 	charDevice     = "c" // or "u"
 	fifoDevice     = "p"
@@ -148,7 +148,7 @@ func DeviceFromPath(path string) (*specs.LinuxDevice, error) {
 	}
 
 	var (
-		devNumber = uint64(stat.Rdev) //nolint: unconvert // the type is 32bit on mips.
+		devNumber = uint64(stat.Rdev) //nolint:unconvert // the type is 32bit on mips.
 		major     = unix.Major(devNumber)
 		minor     = unix.Minor(devNumber)
 	)