gstlal_inspiral_mass_model: ensure num_bins is an int

gstlal-inspiral/bin/gstlal_inspiral_mass_model

@@ -61,7 +61,7 @@ if options.model in ("uniform-template"):
 mchirps_of_tmps = chirpmass(sngl_inspiral_table.getColumnByName("mass1").asarray(), sngl_inspiral_table.getColumnByName("mass2").asarray())
 
 num_templates = len(mchirps_of_tmps)
-num_bins = max(10, num_templates / 10000)
+num_bins = max(10, num_templates // 10000)
 massBA = rate.BinnedDensity(rate.NDBins((rate.LogarithmicBins(min(mchirps_of_tmps)-5e-6, max(mchirps_of_tmps)+5e-6, num_bins),)))
 for m in mchirps_of_tmps:
       massBA.count[(m,)] += 1