oradax: remove redundant null check before kfree

A null check before a kfree is redundant, so remove it.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/sbus/char/oradax.c

@@ -689,8 +689,7 @@ static int dax_open(struct inode *inode, struct file *f)
 alloc_error:
 	kfree(ctx->ccb_buf);
 done:
-	if (ctx != NULL)
-		kfree(ctx);
+	kfree(ctx);
 	return -ENOMEM;
 }