renepay: fix strange gossmap_refresh log

Often I find this in the logs:
DEBUG   plugin-cln-renepay: gossmap ignored 94692259263600 channel updates

Apparently gossmap_refresh does not initialize the input variable num_channel_updates_rejected.
Fix this by explicitely initializing it before calling gossmap_refresh.

Signed-off-by: Lagrang3 <[email protected]>

Author: Lagrang3

plugins/renepay/main.c

@@ -38,7 +38,7 @@ static void memleak_mark(struct plugin *p, struct htable *memtable)
 static const char *init(struct plugin *p,
 			const char *buf UNUSED, const jsmntok_t *config UNUSED)
 {
-	size_t num_channel_updates_rejected;
+	size_t num_channel_updates_rejected = 0;
 
 	tal_steal(p, pay_plugin);
 	pay_plugin->plugin = p;

plugins/renepay/mods.c

@@ -461,7 +461,7 @@ static struct command_result *refreshgossmap_cb(struct payment *payment)
 	assert(payment);
 	assert(payment->local_gossmods);
 
-	size_t num_channel_updates_rejected;
+	size_t num_channel_updates_rejected = 0;
 	bool gossmap_changed =
 	    gossmap_refresh(pay_plugin->gossmap, &num_channel_updates_rejected);