spi: spi-imx: mx51_ecspi_intctrl(): prefer 'unsigned int' to bare use of 'unsigned'

This patch fixes the following checkpatch warning, by making val an
"unsigned int".

| WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
| +       unsigned val = 0;
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220502175457.1977983-4-mkl@pengutronix.deSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-imx.c

@@ -470,7 +470,7 @@ static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
 
 static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
 {
-	unsigned val = 0;
+	unsigned int val = 0;
 
 	if (enable & MXC_INT_TE)
 		val |= MX51_ECSPI_INT_TEEN;