bump opencontainers/selinux v1.2.1

full diff: https://github.com/opencontainers/selinux/compare/v1.2...v1.2.1

brings in opencontainers/selinux#49 Ignore attempts to setLabels "" on SELinux disabled systems

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

vendor.conf

@@ -161,4 +161,4 @@ github.com/morikuni/aec 39771216ff4c63d11f5e604076f9c45e8be1067b
 # metrics
 github.com/docker/go-metrics d466d4f6fd960e01820085bd7e1a24426ee7ef18
 
-github.com/opencontainers/selinux 9e2c5215628a2567782777efb2049f385484f918 # v1.2
+github.com/opencontainers/selinux 0bb7b9fa9ba5c1120e9d22caed4961fca4228408 # v1.2.1

vendor/github.com/opencontainers/selinux/go-selinux/selinux_linux.go

@@ -333,6 +333,11 @@ func writeCon(fpath string, val string) error {
 	if fpath == "" {
 		return ErrEmptyPath
 	}
+	if val == "" {
+		if !GetEnabled() {
+			return nil
+		}
+	}
 
 	out, err := os.OpenFile(fpath, os.O_WRONLY, 0)
 	if err != nil {