add comments around /data/media

Change-Id: I35ad822ed602e2b1018f1e1a0d67499867b60a40
diff --git a/roots.c b/roots.c
index 4997350..9a43bb4 100644
--- a/roots.c
+++ b/roots.c
@@ -334,8 +334,10 @@
         LOGE("unknown volume \"%s\"\n", volume);
         return -1;
     }
+    // check to see if /data is being formatted, and if it is /data/media
+    // Note: the /sdcard check is redundant probably, just being safe.
     if (strstr(volume, "/data") == volume && volume_for_path("/sdcard") == NULL && is_data_media()) {
-	return format_unknown_device(NULL, volume, NULL);
+        return format_unknown_device(NULL, volume, NULL);
     }
     if (strcmp(v->fs_type, "ramdisk") == 0) {
         // you can't format the ramdisk.