nbd: add missing coroutine_fn annotations

Callers of coroutine_fn must be coroutine_fn themselves, or the call
must be within "if (qemu_in_coroutine())".  Apply coroutine_fn to
functions where this holds.

Reviewed-by: Alberto Faria <afaria@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220922084924.201610-11-pbonzini@redhat.com>
[kwolf: Fixed up coding style]
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/nbd.c

@@ -983,11 +983,12 @@ static void nbd_iter_request_error(NBDReplyChunkIter *iter, int ret)
  * nbd_reply_chunk_iter_receive
  * The pointer stored in @payload requires g_free() to free it.
  */
-static bool nbd_reply_chunk_iter_receive(BDRVNBDState *s,
-                                         NBDReplyChunkIter *iter,
-                                         uint64_t handle,
-                                         QEMUIOVector *qiov, NBDReply *reply,
-                                         void **payload)
+static bool coroutine_fn nbd_reply_chunk_iter_receive(BDRVNBDState *s,
+                                                      NBDReplyChunkIter *iter,
+                                                      uint64_t handle,
+                                                      QEMUIOVector *qiov,
+                                                      NBDReply *reply,
+                                                      void **payload)
 {
     int ret, request_ret;
     NBDReply local_reply;