Make re-signing script abort on error.

scripts/image_signing/cros_resign_image_standalone.sh

Index: scripts/image_signing/cros_resign_image_standalone.sh
diff --git a/scripts/image_signing/cros_resign_image_standalone.sh b/scripts/image_signing/cros_resign_image_standalone.sh
index 523d5120950078178038e819de58b815f35f796a..81e6cdad681f94bd6c867d67e0621749d4c68aab 100755
--- a/scripts/image_signing/cros_resign_image_standalone.sh
+++ b/scripts/image_signing/cros_resign_image_standalone.sh
@@ -9,6 +9,9 @@
 
 # Both the cgpt tool and vbutil_kernel should be in the system path. 
 
+# Abort on error
+set -e
+
 # Check arguments
 if [ $# -ne 4 ] ; then
   echo "usage: $0 src_bin dst_bin kernel_datakey kernel_keyblock" 
@@ -54,6 +57,3 @@ dd if="${temp_out_vb}" of="${dst_bin}" seek=$koffset bs=$sector_size \
 
 echo "New signed image was output to ${dst_bin}"
 
-# Clean up temporary files
-rm -f ${temp_kimage}
-rm -f ${temp_out_vb}