ipc/sem.c: use ERR_CAST

Use ERR_CAST(x) rather than ERR_PTR(PTR_ERR(x)).  The former makes more
clear what is the purpose of the operation, which otherwise looks like a
no-op.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
type T;
T x;
identifier f;
@@

T f (...) { <+...
- ERR_PTR(PTR_ERR(x))
+ x
 ...+> }

@@
expression x;
@@

- ERR_PTR(PTR_ERR(x))
+ ERR_CAST(x)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/ipc/sem.c b/ipc/sem.c
index 5b33228..506c849 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -1208,7 +1208,7 @@ static struct sem_undo *find_alloc_undo(struct ipc_namespace *ns, int semid)
        /* step 1: figure out the size of the semaphore array */
        sma = sem_lock_check(ns, semid);
        if (IS_ERR(sma))
-               return ERR_PTR(PTR_ERR(sma));
+               return ERR_CAST(sma);
 
        nsems = sma->sem_nsems;
        sem_getref_and_unlock(sma);