[PATCH] ssi/imx_spi: Removed unnecessary cast and fixed condition in while statement

[Eden Mikitas <e.mikitas@gmail.com>]

When inserting the value retrieved (rx) from the spi slave, rx is pushed to
rx_fifo after being cast to uint8_t. rx_fifo is a fifo32, and the rx
register the driver uses is also 32 bit. This zeroes the 24 most
significant bits of rx. This proved problematic with devices that expect to
use the whole 32 bits of the rx register.
I tested this change by running `make check` and by booting linux on
sabrelite (which uses an spi flash device).

Signed-off-by: Eden Mikitas <e.mikitas@gmail.com>
---
 hw/ssi/imx_spi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/ssi/imx_spi.c b/hw/ssi/imx_spi.c
index 2dd9a631e1..43b2f14dd2 100644
--- a/hw/ssi/imx_spi.c
+++ b/hw/ssi/imx_spi.c
@@ -182,7 +182,7 @@ static void imx_spi_flush_txfifo(IMXSPIState *s)
 
         rx = 0;
 
-        while (tx_burst) {
+        while (tx_burst > 0) {
             uint8_t byte = tx & 0xff;
 
             DPRINTF("writing 0x%02x\n", (uint32_t)byte);
@@ -206,7 +206,7 @@ static void imx_spi_flush_txfifo(IMXSPIState *s)
         if (fifo32_is_full(&s->rx_fifo)) {
             s->regs[ECSPI_STATREG] |= ECSPI_STATREG_RO;
         } else {
-            fifo32_push(&s->rx_fifo, (uint8_t)rx);
+            fifo32_push(&s->rx_fifo, rx);
         }
 
         if (s->burst_length <= 0) {
-- 
2.17.1