fetch-negotiator: add specific noop initializer

Add a specific initializer for the noop fetch negotiator. This is
introduced to support allowing partial clones to skip commit negotiation
when performing a "refetch".

Signed-off-by: Robert Coup <robert@coup.net.nz>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

fetch-negotiator.c

@@ -23,3 +23,8 @@ void fetch_negotiator_init(struct repository *r,
 		return;
 	}
 }
+
+void fetch_negotiator_init_noop(struct fetch_negotiator *negotiator)
+{
+	noop_negotiator_init(negotiator);
+}

fetch-negotiator.h

@@ -53,7 +53,15 @@ struct fetch_negotiator {
 	void *data;
 };
 
+/*
+ * Initialize a negotiator based on the repository settings.
+ */
 void fetch_negotiator_init(struct repository *r,
 			   struct fetch_negotiator *negotiator);
 
+/*
+ * Initialize a noop negotiator.
+ */
+void fetch_negotiator_init_noop(struct fetch_negotiator *negotiator);
+
 #endif