eccdata: Emit correct ecc_Bmodq_shifted for curve448

In curve448, the bit size of the order is slightly smaller than the
one of p's.  Adjust ecc_Bmodq_shifted accordingly.
Signed-off-by: Daiki Ueno <dueno@redhat.com>

eccdata.c

@@ -1014,16 +1014,19 @@ output_curve (const struct ecc_curve *ecc, unsigned bits_per_limb)
 	      exit (EXIT_FAILURE);
 	    }
 	}
+    }
+  else
+    printf ("#define ecc_Bmodp_shifted ecc_Bmodp\n");
+
+  if (bits < limb_size * bits_per_limb)
+    {
       mpz_set_ui (t, 0);
-      mpz_setbit (t, ecc->bit_size);
+      mpz_setbit (t, bits);
       mpz_sub (t, t, ecc->q);      
       output_bignum ("ecc_Bmodq_shifted", t, limb_size, bits_per_limb);      
     }
   else
-    {
-      printf ("#define ecc_Bmodp_shifted ecc_Bmodp\n");
-      printf ("#define ecc_Bmodq_shifted ecc_Bmodq\n");
-    }
+    printf ("#define ecc_Bmodq_shifted ecc_Bmodq\n");
 
   mpz_add_ui (t, ecc->p, 1);
   mpz_fdiv_q_2exp (t, t, 1);