gstlal_inspiral_create_dt_dphi_snr_ratio_pdfs: fix typo that raised an error within an error

gstlal-inspiral/bin/gstlal_inspiral_create_dt_dphi_snr_ratio_pdfs

@@ -29,7 +29,7 @@ options = parser.parse_args()
 
 if options.start is not None and options.stop is not None:
 	if options.start % inspiral_extrinsics.TimePhaseSNR.numchunks or options.stop % inspiral_extrinsics.TimePhaseSNR.numchunks:
-		raise ValueError("start and stop must be multiple of %d" % TimePhaseSNR.numchunks)
+		raise ValueError("start and stop must be multiple of %d" % inspiral_extrinsics.TimePhaseSNR.numchunks)
 	IE = inspiral_extrinsics.TimePhaseSNR.from_hdf5(fname = options.cov_mat_h5, verbose = True, margstart = options.start, margstop = options.stop)
 else:
 	IE = inspiral_extrinsics.TimePhaseSNR.from_hdf5(fname = options.cov_mat_h5, verbose = True)