openssl/ossl.h: calculate as long

* ext/openssl/ossl.h (ossl_str_adjust): calculate as long, not
  casting to int.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44582 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/openssl/ossl.h

@@ -137,8 +137,8 @@ VALUE ossl_x509name_sk2ary(STACK_OF(X509_NAME) *names);
 VALUE ossl_buf2str(char *buf, int len);
 #define ossl_str_adjust(str, p) \
 do{\
-    int len = RSTRING_LENINT(str);\
-    int newlen = rb_long2int((p) - (unsigned char*)RSTRING_PTR(str));\
+    long len = RSTRING_LEN(str);\
+    long newlen = (long)((p) - (unsigned char*)RSTRING_PTR(str));\
     assert(newlen <= len);\
     rb_str_set_len((str), newlen);\
 }while(0)