Use correct path when extracting tar.gz image

Fix issue with file:/ image urls.

Change-Id: I8c5f5b27b5d6ebe5be84dc58d37752adbd12f89b
Closes-Bug: 1277609
diff --git a/functions b/functions
index 80f98ad..b1317c5 100644
--- a/functions
+++ b/functions
@@ -246,7 +246,7 @@
             xdir="$FILES/images/$IMAGE_NAME"
             rm -Rf "$xdir";
             mkdir "$xdir"
-            tar -zxf $FILES/$IMAGE_FNAME -C "$xdir"
+            tar -zxf $IMAGE -C "$xdir"
             KERNEL=$(for f in "$xdir/"*-vmlinuz* "$xdir/"aki-*/image; do
                 [ -f "$f" ] && echo "$f" && break; done; true)
             RAMDISK=$(for f in "$xdir/"*-initrd* "$xdir/"ari-*/image; do