spi: Use reinit_completion at appropriate places

Calling init_completion() once is enough.
For the rest of the iterations, call reinit_completion() instead.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index a5474ef..6bb0b69 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -741,7 +741,7 @@
 	spi_imx->count = transfer->len;
 	spi_imx->txfifo = 0;
 
-	init_completion(&spi_imx->xfer_done);
+	reinit_completion(&spi_imx->xfer_done);
 
 	spi_imx_push(spi_imx);