[PATCH v2] workqueue: Use IS_ERR and PTR_ERR instead of PTR_ERR_OR_ZERO.

[Sean Fu]

Replace inline function PTR_ERR_OR_ZERO with IS_ERR and PTR_ERR to
remove redundant parameter definitions and checks.
Reduce code size.
Before:
   text    data     bss     dec     hex filename
  47510    5979     840   54329    d439 kernel/workqueue.o
After:
   text    data     bss     dec     hex filename
  47474    5979     840   54293    d415 kernel/workqueue.o

Signed-off-by: Sean Fu <fxinr...@gmail.com>
---
Changes in v2:
    - make commit message more clear.

 kernel/workqueue.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 891ccad5f271..ddf0537dce14 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4197,7 +4197,6 @@ static int wq_clamp_max_active(int max_active, unsigned 
int flags,
 static int init_rescuer(struct workqueue_struct *wq)
 {
        struct worker *rescuer;
-       int ret;

        if (!(wq->flags & WQ_MEM_RECLAIM))
                return 0;
@@ -4208,10 +4207,9 @@ static int init_rescuer(struct workqueue_struct *wq)

        rescuer->rescue_wq = wq;
        rescuer->task = kthread_create(rescuer_thread, rescuer, "%s", wq->name);
-       ret = PTR_ERR_OR_ZERO(rescuer->task);
-       if (ret) {
+       if (IS_ERR(rescuer->task)) {
                kfree(rescuer);
-               return ret;
+               return PTR_ERR(rescuer->task);
        }

        wq->rescuer = rescuer;
--
2.16.4