hashmap_entry_init takes "struct hashmap_entry *"

C compilers do type checking to make life easier for us.  So
rely on that and update all hashmap_entry_init callers to take
"struct hashmap_entry *" to avoid future bugs while improving
safety and readability.

Signed-off-by: Eric Wong <e@80x24.org>
Reviewed-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/revision.c b/revision.c
index 0741229..3461c78 100644
--- a/revision.c
+++ b/revision.c
@@ -141,7 +141,7 @@ static void paths_and_oids_insert(struct hashmap *map,
 	struct path_and_oids_entry key;
 	struct path_and_oids_entry *entry;
 
-	hashmap_entry_init(&key, hash);
+	hashmap_entry_init(&key.ent, hash);
 
 	/* use a shallow copy for the lookup */
 	key.path = (char *)path;
@@ -149,7 +149,7 @@ static void paths_and_oids_insert(struct hashmap *map,
 
 	if (!(entry = (struct path_and_oids_entry *)hashmap_get(map, &key, NULL))) {
 		entry = xcalloc(1, sizeof(struct path_and_oids_entry));
-		hashmap_entry_init(entry, hash);
+		hashmap_entry_init(&entry->ent, hash);
 		entry->path = xstrdup(key.path);
 		oidset_init(&entry->trees, 16);
 		hashmap_put(map, entry);