allow precise device detection

Change-Id: Ie837500d459c95df0b1a5f849b3eba718cf8cf09
diff --git a/flashutils/erase_image.c b/flashutils/erase_image.c
index c495255..b09a424 100644
--- a/flashutils/erase_image.c
+++ b/flashutils/erase_image.c
@@ -99,5 +99,5 @@
         return 2;
     }
 
-    return erase_raw_partition(argv[1]);
+    return erase_raw_partition(NULL, argv[1]);
 }