* thread_pthread.c (ruby_init_stack): Avoid using uninitialized value.
  stackaddr and size are not set if get_stack() fails.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40102 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* thread_pthread.c: Fixes wrong scopes of #if USE_SLEEPY_TIMER_THREAD
  .. #endif sections.  This fixes a build error on NativeClient.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40103 b2dd03c8-39d4-4d8f-98ff-823fe69b080e