use EXIT_SUCCESS instead of 0

bfps/_base.py

@@ -136,7 +136,7 @@ class _base(object):
                             'else {0} = 0.0;\n').format(key_prefix + key[i])
             src_txt += 'H5Dclose(dset);\n'
         src_txt += 'H5Fclose(parameter_file);\n'
-        src_txt += 'return 0;\n}\n' # finishing read_parameters
+        src_txt += 'return EXIT_SUCCESS;\n}\n' # finishing read_parameters
         return src_txt
     def cprint_pars(self):
         key = sorted(list(self.parameters.keys()))