Define mgcp_rtp_end.output_enabled as bool

Change-Id: I55f7796ef774f86050041f2c5e3a2f8f7d1f56df
diff --git a/src/libosmo-mgcp/mgcp_conn.c b/src/libosmo-mgcp/mgcp_conn.c
index 5c3c60e..9c2fb0f 100644
--- a/src/libosmo-mgcp/mgcp_conn.c
+++ b/src/libosmo-mgcp/mgcp_conn.c
@@ -108,7 +108,7 @@
 	/* Set default values */
 	end->frames_per_packet = 0;	/* unknown */
 	end->packet_duration_ms = DEFAULT_RTP_AUDIO_PACKET_DURATION_MS;
-	end->output_enabled = 0;
+	end->output_enabled = false;
 	end->maximum_packet_time = -1;
 
 	conn_rtp->rate_ctr_group = rate_ctr_group_alloc(conn, &rate_ctr_group_desc, rate_ctr_index++);