annotate S_ithread_free mutex use

threads.xs:276:13: warning: releasing mutex 'thread->mutex' that was not held [-Wthread-safety-analysis]
                  MUTEX_UNLOCK(&thread->mutex);

threads.xs:282:5: warning: releasing mutex 'thread->mutex' that was not held [-Wthread-safety-analysis]
          MUTEX_UNLOCK(&thread->mutex);

threads.xs:394:1: warning: mutex 'thread->mutex' is still held at the end of
      function [-Wthread-safety-analysis]
}

threads.xs:677:1: warning: mutex 'thread->mutex' is still held at the end of
      function [-Wthread-safety-analysis]
}

1 files changed, 1 insertions, 0 deletions

diff --git a/dist/threads/threads.xs b/dist/threads/threads.xs
index 366877eb09..10b0d9f0fd 100644
--- a/dist/threads/threads.xs
+++ b/dist/threads/threads.xs
@@ -264,6 +264,7 @@ S_ithread_clear(pTHX_ ithread *thread)
  */
 STATIC void
 S_ithread_free(pTHX_ ithread *thread)
+  PERL_TSA_RELEASE(thread->mutex)
 {
 #ifdef WIN32
     HANDLE handle;