[PATCH v2 02/21] migration: switch to use QIOChannelNull for dummy channel

["Daniel P. Berrangé" <berrange@redhat.com>]

This removes one further custom impl of QEMUFile, in favour of a
QIOChannel based impl.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 migration/ram.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index 5f5e37f64d..89082716d6 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -32,11 +32,13 @@
 #include "qemu/bitmap.h"
 #include "qemu/madvise.h"
 #include "qemu/main-loop.h"
+#include "io/channel-null.h"
 #include "xbzrle.h"
 #include "ram.h"
 #include "migration.h"
 #include "migration/register.h"
 #include "migration/misc.h"
+#include "migration/qemu-file-channel.h"
 #include "qemu-file.h"
 #include "postcopy-ram.h"
 #include "page_cache.h"
@@ -457,8 +459,6 @@ static QemuThread *compress_threads;
  */
 static QemuMutex comp_done_lock;
 static QemuCond comp_done_cond;
-/* The empty QEMUFileOps will be used by file in CompressParam */
-static const QEMUFileOps empty_ops = { };
 
 static QEMUFile *decomp_file;
 static DecompressParam *decomp_param;
@@ -569,7 +569,8 @@ static int compress_threads_save_setup(void)
         /* comp_param[i].file is just used as a dummy buffer to save data,
          * set its ops to empty.
          */
-        comp_param[i].file = qemu_fopen_ops(NULL, &empty_ops, false);
+        comp_param[i].file = qemu_fopen_channel_output(
+            QIO_CHANNEL(qio_channel_null_new()));
         comp_param[i].done = true;
         comp_param[i].quit = false;
         qemu_mutex_init(&comp_param[i].mutex);
-- 
2.36.1