hashmap_get{,_from_hash} return "struct hashmap_entry *"

Update callers to use hashmap_get_entry, hashmap_get_entry_from_hash
or container_of as appropriate.

This is another step towards eliminating the requirement of
hashmap_entry being the first field in a struct.

Signed-off-by: Eric Wong <e@80x24.org>
Reviewed-by: Derrick Stolee <stolee@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

sub-process.c

@@ -22,7 +22,8 @@ struct subprocess_entry *subprocess_find_entry(struct hashmap *hashmap, const ch
 
 	hashmap_entry_init(&key.ent, strhash(cmd));
 	key.cmd = cmd;
-	return hashmap_get(hashmap, &key.ent, NULL);
+	return hashmap_get_entry(hashmap, &key, NULL,
+				struct subprocess_entry, ent);
 }
 
 int subprocess_read_status(int fd, struct strbuf *status)