trace-events: drop orphan virtio_blk_data_plane_complete_request

This trace event has not been in use since commit
b002254d ("virtio-blk: Unify
{non-,}dataplane's request handlings").

Cc: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1411394595-15300-2-git-send-email-stefanha@redhat.com

trace-events

@@ -121,7 +121,6 @@ virtio_blk_handle_read(void *req, uint64_t sector, size_t nsectors) "req %p sect
 virtio_blk_data_plane_start(void *s) "dataplane %p"
 virtio_blk_data_plane_stop(void *s) "dataplane %p"
 virtio_blk_data_plane_process_request(void *s, unsigned int out_num, unsigned int in_num, unsigned int head) "dataplane %p out_num %u in_num %u head %u"
-virtio_blk_data_plane_complete_request(void *s, unsigned int head, int ret) "dataplane %p head %u ret %d"
 
 # hw/virtio/dataplane/vring.c
 vring_setup(uint64_t physical, void *desc, void *avail, void *used) "vring physical %#"PRIx64" desc %p avail %p used %p"