had to cleanup a lot in relation to optional returns

lib/installers/sysadmintools/restic/builder.v

@@ -18,7 +18,7 @@ pub mut:
 // install restic will return true if it was already installed
 pub fn build_(args BuildArgs) ! {
 	// make sure we install base on the node
-	if osal.platform() != .ubuntu {
+	if core.platform()!= .ubuntu {
 		return error('only support ubuntu for now')
 	}
 	golang.install()!