extcon: max77843: fix handling return value of regmap_irq_get_virq

The function can return negative values, so its result should
be assigned to signed variable.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/assign_signed_to_unsigned.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2046107

Signed-off-by: Andrzej Hajda <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/extcon/extcon-max77843.c

···
 
 	for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
 		struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
-		unsigned int virq = 0;
+		int virq = 0;
 
 		virq = regmap_irq_get_virq(max77843->irq_data_muic,
 				muic_irq->irq);