MT#55283 add missing iters increment

This is checked for race conditions but is not actually increased
anywhere.

Fixes #2148

Change-Id: Ia46ea32ffea6abf267f7ae872368f4f9c4446f29
(cherry picked from commit 5daae51b5b)
(cherry picked from commit 619b785a98)

daemon/ssrc.c

@@ -246,6 +246,7 @@ void *get_ssrc_full(uint32_t ssrc, struct ssrc_hash *ht, bool *created) {
 		add_ssrc_entry(ssrc, ent, ht);
 		if (created)
 			*created = true;
+		ht->iters++;
 
 		return ent;
 	}