crypto: bcm - Remove the unnecessary cast for PTR_ERR().

It's not necessary to specify 'int' casting for PTR_ERR().
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/bcm/cipher.c

@@ -4436,7 +4436,7 @@ static int spu_mb_init(struct device *dev)
 	for (i = 0; i < iproc_priv.spu.num_chan; i++) {
 		iproc_priv.mbox[i] = mbox_request_channel(mcl, i);
 		if (IS_ERR(iproc_priv.mbox[i])) {
-			err = (int)PTR_ERR(iproc_priv.mbox[i]);
+			err = PTR_ERR(iproc_priv.mbox[i]);
 			dev_err(dev,
 				"Mbox channel %d request failed with err %d",
 				i, err);