internal.h: fix no-DLONG case

* internal.h (rb_fix_mul_fix): multiply converted values, not
  object VALUEs.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54212 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Mar 21 22:09:24 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* internal.h (rb_fix_mul_fix): multiply converted values, not
+	  object VALUEs.
+
 Mon Mar 21 20:18:29 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* common.mk (TEST_EXCLUDES, EXCLUDE_TESTFRAMEWORK): use full spell

internal.h

@@ -284,11 +284,11 @@ rb_fix_mul_fix(VALUE x, VALUE y)
 #ifdef DLONG
     return DL2NUM((DLONG)lx * (DLONG)ly);
 #else
-    if (MUL_OVERFLOW_FIXNUM_P(x, y)) {
-	return rb_big_mul(rb_int2big(x), rb_int2big(y));
+    if (MUL_OVERFLOW_FIXNUM_P(lx, ly)) {
+	return rb_big_mul(rb_int2big(lx), rb_int2big(ly));
     }
     else {
-	return LONG2FIX(x * y);
+	return LONG2FIX(lx * ly);
     }
 #endif
 }