euc_jp.c: fix compile error

* enc/euc_jp.c (mbc_case_fold): no longer use get_lower_case
  result.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52020 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

enc/euc_jp.c

@@ -382,7 +382,7 @@ mbc_case_fold(OnigCaseFoldType flag,
 
     len = mbc_enc_len(p, end, enc);
     if (len <= 0) return 1;
-    code = get_lower_case(mbc_to_code(p, end, enc));
+    get_lower_case(mbc_to_code(p, end, enc));
     /* assuming case folding in euc-jp doesn't change length */
     (*pp) += len;
     return len; /* return byte length of converted char to lower */