crypto: brcm - Avoid double free in ahash_finup()

In Broadcom SPU driver, in case where incremental hash
is done in software in ahash_finup(), tmpbuf was freed
twice.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Rob Rice <rob.rice@broadcom.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/bcm/cipher.c

@@ -2331,7 +2331,6 @@ static int ahash_finup(struct ahash_request *req)
 		/* Call synchronous update */
 		ret = crypto_shash_finup(ctx->shash, tmpbuf, req->nbytes,
 					 req->result);
-		kfree(tmpbuf);
 	} else {
 		/* Otherwise call the internal function which uses SPU hw */
 		return __ahash_finup(req);