[CRYPTO]: crypto_free_tfm() callers no longer need to check for NULL

Since the patch to add a NULL short-circuit to crypto_free_tfm() went in,
there's no longer any need for callers of that function to check for NULL.
This patch removes the redundant NULL checks and also a few similar checks
for NULL before calls to kfree() that I ran into while doing the
crypto_free_tfm bits.

I've succesfuly compile tested this patch, and a kernel with the patch 
applied boots and runs just fine.

When I posted the patch to LKML (and other lists/people on Cc) it drew the
following comments :

 J. Bruce Fields commented
  "I've no problem with the auth_gss or nfsv4 bits.--b."

 Sridhar Samudrala said
  "sctp change looks fine."

 Herbert Xu signed off on the patch.

So, I guess this is ready to be dropped into -mm and eventually mainline.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 12 deletions

diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 0ebfad907a03..f3629730eb15 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -401,10 +401,8 @@ static int ah6_init_state(struct xfrm_state *x)
 
 error:
         if (ahp) {
-                if (ahp->work_icv)
-                        kfree(ahp->work_icv);
-                if (ahp->tfm)
-                        crypto_free_tfm(ahp->tfm);
+                kfree(ahp->work_icv);
+                crypto_free_tfm(ahp->tfm);
                 kfree(ahp);
         }
         return -EINVAL;
@@ -417,14 +415,10 @@ static void ah6_destroy(struct xfrm_state *x)
         if (!ahp)
                 return;
 
-        if (ahp->work_icv) {
-                kfree(ahp->work_icv);
-                ahp->work_icv = NULL;
-        }
-        if (ahp->tfm) {
-                crypto_free_tfm(ahp->tfm);
-                ahp->tfm = NULL;
-        }
+        kfree(ahp->work_icv);
+        ahp->work_icv = NULL;
+        crypto_free_tfm(ahp->tfm);
+        ahp->tfm = NULL;
         kfree(ahp);
 }