scripts: coccinelle: Add guideline number on a script output

Add information about the guideline number in the script checking a
identifier length.

Signed-off-by: Flavio Ceolin <[email protected]>

Author: Flavio Ceolin

scripts/coccinelle/identifier_length.cocci

@@ -26,5 +26,5 @@ pos << r_idlen.p;
 @@
 
 if (len(id) > 31):
-   msg="WARNING: Identifier %s length %d > 31" % (id, len(id))
+   msg="WARNING: Violation to rule 5.1 or 5.2 (Identifiers shall be distinct) %s length %d > 31" % (id, len(id))
    coccilib.report.print_report(pos[0], msg)