spi: davinci: do not treat Tx interrupt being set as error

In davinci_spi_check_error(), Tx interrupt being set is
treated as error. This function is only meant to flag
bus error conditions and Tx interrupt being set at that
point is not a bus error but rather a driver bug.

Stop checking for Tx interrupt and flagging that as an
IO error.
Tested-By: Michael Williamson <michael.williamson@criticallink.com>
Tested-By: Brian Niebuhr <bniebuhr@efjohnson.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

drivers/spi/davinci_spi.c

@@ -590,10 +590,6 @@ static int davinci_spi_check_error(struct davinci_spi *davinci_spi,
 			dev_dbg(sdev, "SPI Data Overrun error\n");
 			return -EIO;
 		}
-		if (int_status & SPIFLG_TX_INTR_MASK) {
-			dev_dbg(sdev, "SPI TX intr bit set\n");
-			return -EIO;
-		}
 		if (int_status & SPIFLG_BUF_INIT_ACTIVE_MASK) {
 			dev_dbg(sdev, "SPI Buffer Init Active\n");
 			return -EBUSY;