tpm_tis: Use platform_get_irq

Replace the open coded IORESOURCE_IRQ with platform_get_irq, which
supports more cases.

Fixes: 00194826e6be ("tpm_tis: Clean up the force=1 module parameter")
Signed-off-by: Jason Gunthorpe <[e-mail]>
Reviewed-by: Jarkko Sakkinen <[e-mail]>
Tested-by: Jerry Snitselaar <[e-mail]> (with TPM 2.0)
Tested-by: Jarkko Sakkinen <[e-mail]> (with TPM 1.2)
Signed-off-by: Jarkko Sakkinen <[e-mail]>

drivers/char/tpm/tpm_tis.c

···
 	}
 	tpm_info.res = *res;
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (res) {
-		tpm_info.irq = res->start;
-	} else {
+	tpm_info.irq = platform_get_irq(pdev, 0);
+	if (tpm_info.irq <= 0) {
 		if (pdev != force_pdev)
 			tpm_info.irq = -1;
 		else