coccinelle: simplify hashmap.cocci?

Hello,

I would like to comment implementation details from the commit 12878c83516e3b82f31a20f1b5431b7ff607a8db ("coccicheck: detect hashmap_entry.hash assignment").

1. Would you occasionally like to try a change specification out
   like the following?

-HME.hash =
+hashmap_entry_init(&HME,
 E
+)
 ;

2. How do you think about to use a code variant (for the semantic patch language)
   which can work without a regular expression for the exclusion of a single item?

identifier f != hashmap_entry_init;

Regards, Markus