fix invalid size prefix

Author: minad

demo/test.c

@@ -555,9 +555,9 @@ static int test_mp_get_long(void)
    }
 
    for (i = 0; i < ((int)(sizeof(unsigned long)*CHAR_BIT) - 1); ++i) {
-      t = (1ULL << (i+1)) - 1;
+      t = (1UL << (i+1)) - 1;
       if (!t)
-         t = ~0ULL;
+         t = ~0UL;
       printf(" t = 0x%lx i = %d\r", t, i);
       do {
          if (mp_set_long(&a, t) != MP_OKAY) {