Merge branch 'rs/strbuf-cocci-workaround'

Update Coccinelle rules to catch and optimize strbuf_addf(&buf, "%s", str)

* rs/strbuf-cocci-workaround:
  cocci: use format keyword instead of a literal string

contrib/coccinelle/strbuf.cocci

@@ -29,8 +29,9 @@ cocci.include_match("%" not in fmt)
 
 @@
 expression E1, E2;
+format F =~ "s";
 @@
-- strbuf_addf(E1, "%s", E2);
+- strbuf_addf(E1, "%@F@", E2);
 + strbuf_addstr(E1, E2);
 
 @@