free NULL cleanup -- coda

After the finale, the "real" final part. :)  Do a recursive grep with
"-B1 -w [a-zA-Z0-9_]*_free" to see if any of the preceeding lines are
an "if NULL" check that can be removed.

Reviewed-by: Tim Hudson <tjh@openssl.org>

crypto/stack/stack.c

@@ -106,8 +106,7 @@ _STACK *sk_dup(_STACK *sk)
     ret->comp = sk->comp;
     return (ret);
  err:
-    if (ret)
-        sk_free(ret);
+    sk_free(ret);
     return (NULL);
 }