debug log: fix line endings for abis_rsl_rx_rll logging

This function outputs a debug log without line ending, which should be
completed by a subsequent DEBUGPC(), so complete the started log line where
missing in three of the switch cases.

The three cases do print another log message, but since these don't start on a
new line when RLL is in debug level, the log output for these is hard(er) to
read without this patch.

Change-Id: I355647e77e1b2d8e75ae1a167fe87a507a38d82d

openbsc/src/libbsc/abis_rsl.c

@@ -1773,13 +1773,16 @@ static int abis_rsl_rx_rll(struct msgb *msg)
 		rsl_handle_release(msg->lchan);
 		break;
 	case RSL_MT_ERROR_IND:
+		DEBUGPC(DRLL, "ERROR INDICATION\n");
 		rc = rsl_rx_rll_err_ind(msg);
 		break;
 	case RSL_MT_UNIT_DATA_IND:
+		DEBUGPC(DRLL, "UNIT DATA INDICATION\n");
 		LOGP(DRLL, LOGL_NOTICE, "unimplemented Abis RLL message "
 			"type 0x%02x\n", rllh->c.msg_type);
 		break;
 	default:
+		DEBUGPC(DRLL, "UNKNOWN\n");
 		LOGP(DRLL, LOGL_NOTICE, "unknown Abis RLL message "
 			"type 0x%02x\n", rllh->c.msg_type);
 	}