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imx8/gpio: use u32int for bit mask

--- a/sys/src/9/imx8/gpio.c

+++ b/sys/src/9/imx8/gpio.c

@@ -57,7 +57,7 @@

 void

 gpioout(uint pin, int set)

 {

-	int bit = 1 << (pin % 32);

+	u32int bit = 1 << (pin % 32);

 	Ctlr *ctlr = enable(pin);

 	if(ctlr == nil)

 		return;

@@ -72,7 +72,7 @@

 int

 gpioin(uint pin)

 {

-	int bit = 1 << (pin % 32);

+	u32int bit = 1 << (pin % 32);

 	Ctlr *ctlr = enable(pin);

 	if(ctlr == nil)

 		return -1;