writeback: remove unnecessary wait in throttle_vm_writeout()

We don't want to introduce pointless delays in throttle_vm_writeout() when
the writeback limits are not yet exceeded, do we?

Cc: Nick Piggin <[email protected]>
Cc: OGAWA Hirofumi <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Pete Zaitcev <[email protected]>
Cc: Greg KH <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Signed-off-by: Fengguang Wu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed