bignum.c: suppress a warning

* bignum.c (rb_cstr_to_inum): remove set but unused variable.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42329 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bignum.c

@@ -3801,8 +3801,7 @@ rb_cstr_to_inum(const char *str, int base, int badcheck)
     }
     else {
         int digits_per_bdigits_dbl;
-        BDIGIT_DBL power;
-        power = maxpow_in_bdigit_dbl(base, &digits_per_bdigits_dbl);
+        maxpow_in_bdigit_dbl(base, &digits_per_bdigits_dbl);
         num_bdigits = roomof(num_digits, digits_per_bdigits_dbl)*2;
 
         if (num_bdigits < KARATSUBA_MUL_DIGITS) {