make-image-header: set -e so that errors are noticed

diff --git a/make-image-header.sh b/make-image-header.sh
index 6386038..d7cf67c 100755 (executable)
--- a/make-image-header.sh
+++ b/make-image-header.sh
@@ -1,4 +1,7 @@
 #!/bin/sh
+
+set -e
+
 imageh=`basename $1 .png`-img.h
 name="${2}_IMG"
 gdk-pixbuf-csource --macros $1 > $imageh.tmp