merges a part of r30840 from trunk into ruby_1_9_2.

--
* gc.h (RUBY_FREE_UNLESS_NULL): get rid of double free.
  [ruby-core:35192]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@31514 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index f7dbb178e2..01231f7235 100644
--- a/vm.c
+++ b/vm.c
@@ -221,7 +221,7 @@ env_free(void * const ptr)
 {
     RUBY_FREE_ENTER("env");
     if (ptr) {
-	const rb_env_t * const env = ptr;
+	rb_env_t *const env = ptr;
 	RUBY_FREE_UNLESS_NULL(env->env);
 	ruby_xfree(ptr);
     }