add comments around /data/media

Change-Id: I35ad822ed602e2b1018f1e1a0d67499867b60a40
diff --git a/nandroid.c b/nandroid.c
index 76d0962..fc39359 100644
--- a/nandroid.c
+++ b/nandroid.c
@@ -437,7 +437,7 @@
         }
 
         // If the fs_type of this volume is "auto" or mount_point is /data
-        // and vol for /sdcard is NULL and is_data_media, let's revert
+        // and is_data_media (redundantly, and vol for /sdcard is NULL), let's revert
         // to using a rm -rf, rather than trying to do a
         // ext3/ext4/whatever format.
         // This is because some phones (like DroidX) will freak out if you