Actually fix the parentFile warning

Author: triallax

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionFragment.kt

@@ -207,8 +207,9 @@ class SubscriptionFragment : BaseStateFragment<SubscriptionState>() {
         super.onActivityResult(requestCode, resultCode, data)
         if (data != null && data.data != null && resultCode == Activity.RESULT_OK) {
             if (requestCode == REQUEST_EXPORT_CODE) {
-                val exportFile = Utils.getFileForUri(data.data!!)!!
-                if (!exportFile.parentFile.canWrite() || !exportFile.parentFile.canRead()) {
+                val exportFile = Utils.getFileForUri(data.data!!)
+                val parentFile = exportFile.parentFile!!
+                if (!parentFile.canWrite() || !parentFile.canRead()) {
                     Toast.makeText(activity, R.string.invalid_directory, Toast.LENGTH_SHORT).show()
                 } else {
                     activity.startService(