block: set job->speed in block_set_speed

There is no need to do this in every implementation of set_speed
(even though there is only one right now).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block.c

@@ -4085,10 +4085,16 @@ void block_job_complete(BlockJob *job, int ret)
 
 int block_job_set_speed(BlockJob *job, int64_t value)
 {
+    int rc;
+
     if (!job->job_type->set_speed) {
         return -ENOTSUP;
     }
-    return job->job_type->set_speed(job, value);
+    rc = job->job_type->set_speed(job, value);
+    if (rc == 0) {
+        job->speed = value;
+    }
+    return rc;
 }
 
 void block_job_cancel(BlockJob *job)

block/stream.c

@@ -236,7 +236,6 @@ static int stream_set_speed(BlockJob *job, int64_t value)
     if (value < 0) {
         return -EINVAL;
     }
-    job->speed = value;
     ratelimit_set_speed(&s->limit, value / BDRV_SECTOR_SIZE);
     return 0;
 }