[gimp] app: fix gimp-parallel shutdown

[N/A <ell src gnome org>]

commit 4c767b4f03416df328954324a94ade4bbfc7c037
Author: Ell <ell_se yahoo com>
Date:   Sun May 13 11:50:33 2018 -0400

    app: fix gimp-parallel shutdown
    
    Some leftover from an earlier version.  Caused gimp_parallel_exit()
    to hang, although we could only notice that in GIMP_UNSTABLE
    builds.

 app/core/gimp-parallel.cc |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/app/core/gimp-parallel.cc b/app/core/gimp-parallel.cc
index 29f5678..a9bab9c 100644
--- a/app/core/gimp-parallel.cc
+++ b/app/core/gimp-parallel.cc
@@ -97,7 +97,6 @@ static GimpParallelRunAsyncThread   gimp_parallel_run_async_threads[GIMP_PARALLE
 static GMutex                       gimp_parallel_run_async_mutex;
 static GCond                        gimp_parallel_run_async_cond;
 static GQueue                       gimp_parallel_run_async_queue = G_QUEUE_INIT;
-static gboolean                     gimp_parallel_run_async_quit;
 
 static gint                         gimp_parallel_distribute_n_threads = 1;
 static GimpParallelDistributeThread gimp_parallel_distribute_threads[GIMP_PARALLEL_DISTRIBUTE_MAX_THREADS - 
1];
@@ -403,10 +402,8 @@ gimp_parallel_run_async_thread_func (GimpParallelRunAsyncThread *thread)
     {
       GimpParallelRunAsyncTask *task;
 
-      if (gimp_parallel_run_async_quit)
-        {
-          break;
-        }
+      if (thread->quit)
+        break;
 
       while ((task = (GimpParallelRunAsyncTask *) g_queue_pop_head (&gimp_parallel_run_async_queue)))
         {