[PATCH v6] nbd: well form nbd_iter_channel_error errp handler

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

Make nbd_iter_channel_error errp handler well formed:
rename local_err to errp_in, as it is IN-parameter here (which is
unusual for Error**).

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
---

v6: fix commit message
    add Eric's r-b

 block/nbd.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/block/nbd.c b/block/nbd.c
index 5f18f78a94..345bf902e3 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -864,18 +864,18 @@ typedef struct NBDReplyChunkIter {
 } NBDReplyChunkIter;
 
 static void nbd_iter_channel_error(NBDReplyChunkIter *iter,
-                                   int ret, Error **local_err)
+                                   int ret, Error **errp_in)
 {
-    assert(ret < 0);
+    assert(ret < 0 && errp_in && *errp_in);
 
     if (!iter->ret) {
         iter->ret = ret;
-        error_propagate(&iter->err, *local_err);
+        error_propagate(&iter->err, *errp_in);
     } else {
-        error_free(*local_err);
+        error_free(*errp_in);
     }
 
-    *local_err = NULL;
+    *errp_in = NULL;
 }
 
 static void nbd_iter_request_error(NBDReplyChunkIter *iter, int ret)
-- 
2.21.0