spi: remove unused variable in tegra_slink_read_rx_fifo_to_client_rxbuf()

The variable bits_per_word is initialized but never used
otherwise, so remove the unused variable.
Signed-off-by: NWei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-By: NLaxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>

drivers/spi/spi-tegra20-slink.c

@@ -375,9 +375,6 @@ static unsigned int tegra_slink_read_rx_fifo_to_client_rxbuf(
 		tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
 		read_words += tspi->curr_dma_words;
 	} else {
-		unsigned int bits_per_word;
-
-		bits_per_word = t->bits_per_word;
 		for (count = 0; count < rx_full_count; count++) {
 			x = tegra_slink_readl(tspi, SLINK_RX_FIFO);
 			for (i = 0; (i < tspi->bytes_per_word); i++)