crypto: skcipher - avoid NULL dereference

Stanse found a potential NULL dereference in ablkcipher_next_slow.
Even though kmalloc fails, its retval is dereferenced later. Return
from that function properly earlier.

Signed-off-by: Jiri Slaby <[e-mail]>
Acked-by: David S. Miller <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

crypto/ablkcipher.c

···
 
 	p = kmalloc(n, GFP_ATOMIC);
 	if (!p)
-		ablkcipher_walk_done(req, walk, -ENOMEM);
+		return ablkcipher_walk_done(req, walk, -ENOMEM);
 
 	base = p + 1;