Replace the way that we use mutex in parallels_co_check() for more clean code.

Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
 block/parallels.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/block/parallels.c b/block/parallels.c
index b0982d60d0..3cb5452613 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -577,28 +577,25 @@ static int coroutine_fn parallels_co_check(BlockDriverState *bs,
     BDRVParallelsState *s = bs->opaque;
     int ret;
 
-    qemu_co_mutex_lock(&s->lock);
+    WITH_QEMU_LOCK_GUARD(&s->lock);
 
     parallels_check_unclean(bs, res, fix);
 
     ret = parallels_check_outside_image(bs, res, fix);
     if (ret < 0) {
-        goto out;
+        return ret;
     }
 
     ret = parallels_check_leak(bs, res, fix);
     if (ret < 0) {
-        goto out;
+        return ret;
     }
 
     parallels_check_fragmentation(bs, res, fix);
 
     parallels_collect_statistics(bs, res, fix);
 
-    ret = 0;
-out:
-    qemu_co_mutex_unlock(&s->lock);
-    return ret;
+    return 0;
 }
 
 
-- 
2.34.1