Fix copy in AES-KW.

The AES-KW code from 93a3dcd57262f5bbd84adaa5565abb14f95d79ae would
write 8 bytes past the end of the out buffer.

https://code.google.com/p/chromium/issues/detail?id=398699

Change-Id: I6e1a2884790f69cdbefb59ed60d71459b7327b89
diff --git a/crypto/cipher/e_aes.c b/crypto/cipher/e_aes.c
index 8caac70..03f9e28 100644
--- a/crypto/cipher/e_aes.c
+++ b/crypto/cipher/e_aes.c
@@ -1224,7 +1224,7 @@
   }
 
   memcpy(A, in, 8);
-  memmove(out, in + 8, in_len);
+  memmove(out, in + 8, in_len - 8);
 
   for (j = 5; j < 6; j--) {
     for (i = n; i > 0; i--) {