drivers/net: Remove redundant test

In each case, ap is checked not to be NULL a few lines before.

A simplified version of the semantic patch that makes this change is as
follows: (http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
expression E;
position p1,p2;
@@

if (x@p1 == NULL || ...) { ... when forall
   return ...; }
... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\)
(
x@p2 == NULL
|
x@p2 != NULL
)

// another path to the test that is not through p1?
@s exists@
local idexpression r.x;
position r.p1,r.p2;
@@

... when != x@p1
(
x@p2 == NULL
|
x@p2 != NULL
)

@fix depends on !s@
position r.p1,r.p2;
expression x,E;
statement S1,S2;
@@

(
- if ((x@p2 != NULL) || ...)
  S1
|
- if ((x@p2 == NULL) && ...) S1
|
- BUG_ON(x@p2 == NULL);
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 6 deletions

diff --git a/drivers/net/ppp_async.c b/drivers/net/ppp_async.c
index 451bdb57d6fc..6567fabd2e13 100644
--- a/drivers/net/ppp_async.c
+++ b/drivers/net/ppp_async.c
@@ -293,9 +293,6 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
         err = -EFAULT;
         switch (cmd) {
         case PPPIOCGCHAN:
-                err = -ENXIO;
-                if (!ap)
-                        break;
                 err = -EFAULT;
                 if (put_user(ppp_channel_index(&ap->chan), p))
                         break;
@@ -303,9 +300,6 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
                 break;
 
         case PPPIOCGUNIT:
-                err = -ENXIO;
-                if (!ap)
-                        break;
                 err = -EFAULT;
                 if (put_user(ppp_unit_number(&ap->chan), p))
                         break;