Minor code clean up in pair_granular.cpp

      normal_coeffs_one[1] = force->numeric(FLERR,arg[iarg+2]); // damping

      iarg += 3;

    } else if (strcmp(arg[iarg], "hertz") == 0) {

      int num_coeffs = 2;

      if (iarg + num_coeffs >= narg)

      if (iarg + 2 >= narg)

        error->all(FLERR,"Illegal pair_coeff command, "

                   "not enough parameters provided for Hertz option");

      normal_model_one = HERTZ;

      normal_coeffs_one[0] = force->numeric(FLERR,arg[iarg+1]); // kn

      normal_coeffs_one[1] = force->numeric(FLERR,arg[iarg+2]); // damping

      iarg += num_coeffs+1;

      iarg += 3;

    } else if (strcmp(arg[iarg], "hertz/material") == 0) {

      int num_coeffs = 3;

      if (iarg + num_coeffs >= narg)

      if (iarg + 3 >= narg)

        error->all(FLERR,"Illegal pair_coeff command, "

                   "not enough parameters provided for Hertz/material option");

      normal_model_one = HERTZ_MATERIAL;

      normal_coeffs_one[0] = force->numeric(FLERR,arg[iarg+1]); // E

      normal_coeffs_one[1] = force->numeric(FLERR,arg[iarg+2]); // damping

      normal_coeffs_one[2] = force->numeric(FLERR,arg[iarg+3]); // Poisson's ratio

      iarg += num_coeffs+1;

      iarg += 4;

    } else if (strcmp(arg[iarg], "dmt") == 0) {

      if (iarg + 4 >= narg)

        error->all(FLERR,"Illegal pair_coeff command, "