commit/stream: Reset delay_ns

Streaming and the commit block job only want to apply throttling when
they actually copied data instead of skipping it, so they made the
calculation of delay_ns conditional. However, delay_ns isn't reset when
skipping some sectors, so instead of not waiting, the old delay is
applied again.

Properly reset delay_ns where needed.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>

block/commit.c

@@ -202,6 +202,8 @@ static void coroutine_fn commit_run(void *opaque)
 
         if (copy && s->common.speed) {
             delay_ns = ratelimit_calculate_delay(&s->limit, n);
+        } else {
+            delay_ns = 0;
         }
     }
 

block/stream.c

@@ -188,6 +188,8 @@ static void coroutine_fn stream_run(void *opaque)
         s->common.offset += n;
         if (copy && s->common.speed) {
             delay_ns = ratelimit_calculate_delay(&s->limit, n);
+        } else {
+            delay_ns = 0;
         }
     }