check-format.pl: Document how to run positive and negative self-tests

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/13019)

diff --git a/util/check-format.pl b/util/check-format.pl
index 0619240f828b3979ca0316d04e76314f9c6f4bdf..e3c0eaddb0094df3a213fba86fa2ef9c2c4ef8d3 100755 (executable)
--- a/util/check-format.pl
+++ b/util/check-format.pl
@@ -17,6 +17,10 @@
 #                   [-h|--sloppy-hang] [-1|--1-stmt]
 #                   <files>
 #
+# run self-tests:
+#   util/check-format.pl util/check-format-test-positives.c
+#   util/check-format.pl util/check-format-test-negatives.c
+#
 # checks adherence to the formatting rules of the OpenSSL coding guidelines
 # assuming that the input files contain syntactically correct C code.
 # This pragmatic tool is incomplete and yields some false positives.