refs: dereference the value of the required pointer

Currently, this always prints yes because required is non-null.

This is the wrong behavior. The boolean must be
dereferenced.

Signed-off-by: Greg Funni <gfunni234@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: AZero13

refs/debug.c

@@ -131,7 +131,7 @@ static int debug_optimize_required(struct ref_store *ref_store,
 	struct debug_ref_store *drefs = (struct debug_ref_store *)ref_store;
 	int res = drefs->refs->be->optimize_required(drefs->refs, opts, required);
 	trace_printf_key(&trace_refs, "optimize_required: %s, res: %d\n",
-			 required ? "yes" : "no", res);
+			 *required ? "yes" : "no", res);
 	return res;
 }