Adapt error messages in tests/scripts/list-*
diff --git a/tests/scripts/list-identifiers.sh b/tests/scripts/list-identifiers.sh
index 549f213..e144cd2 100755
--- a/tests/scripts/list-identifiers.sh
+++ b/tests/scripts/list-identifiers.sh
@@ -2,7 +2,12 @@
 
 set -eu
 
-HEADERS=$( ls include/mbedtls/*.h | egrep -v 'compat-1.2|openssl|bn_mul' )
+if [ -d include/mbedtls ]; then :; else
+    echo "$0: must be run from root" >&2
+    exit 1
+fi
+
+HEADERS=$( ls include/mbedtls/*.h | egrep -v 'bn_mul' )
 
 rm -f identifiers
 
@@ -22,7 +27,7 @@
     egrep -v '^(u?int(16|32|64)_t)$' _identifiers | sort > identifiers
     rm _identifiers
 else
-    echo "Mismatch" 2>&1
+    echo "$0: oops, lost some identifiers" 2>&1
     exit 1
 fi