mgw_main: fix loop that resets all endpoints

The loop that resets all endpoints in read_call_agent() starts counting
at endpoint index 1, but it should begin counting at index 0

Change-Id: I82a385e547e54d82eff95213652317ed2fdaadd8
diff --git a/src/osmo-mgw/mgw_main.c b/src/osmo-mgw/mgw_main.c
index d30378d..113f691 100644
--- a/src/osmo-mgw/mgw_main.c
+++ b/src/osmo-mgw/mgw_main.c
@@ -243,7 +243,7 @@
 
 		/* Walk over all endpoints and trigger a release, this will release all
 		 * endpoints, possible open connections are forcefully dropped */
-		for (i = 1; i < reset_trunk->number_endpoints; ++i)
+		for (i = 0; i < reset_trunk->number_endpoints; ++i)
 			mgcp_endp_release(reset_trunk->endpoints[i]);
 	}