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aux/acpi: ignore bad acpi 2.0 shutdown access widths.

some machines have bad acpi tables with a zero access width.
fall back to acpi 1.0 shutdown in this case.

--- a/sys/src/cmd/aux/acpi.c

+++ b/sys/src/cmd/aux/acpi.c

@@ -516,19 +516,19 @@

 			}

 			/* fall back to the ACPI 1.0 io port method */

-			if(!facp.pm1a) {

+			if(facp.pm1a == 0 || facp.pm1awid == 0) {

 				facp.pm1aspace = IoSpace;

 				facp.pm1awid = 2;

 				facp.pm1a = get32(((uchar*)t) + 64);

 			}

-			if(!facp.pm1b) {

+			if(facp.pm1b == 0 || facp.pm1bwid == 0) {

 				facp.pm1bspace = IoSpace;

 				facp.pm1bwid = 2;

 				facp.pm1b = get32(((uchar*)t) + 68);

 			}

-			if(!facp.gpe0) {

+			if(facp.gpe0 == 0 || facp.gpe0wid == 0) {

 				facp.gpe0space = IoSpace;

 				facp.gpe0wid = 2;

 				facp.gpe0 = get32(((uchar*)t) + 80);

@@ -535,7 +535,7 @@

 				facp.gpe0len = *(((uchar*)t) + 92);

 			}

-			if(!facp.gpe1) {

+			if(facp.gpe1 == 0 || facp.gpe1wid == 0) {

 				facp.gpe1space = IoSpace;

 				facp.gpe1wid = 2;

 				facp.gpe1 = get32(((uchar*)t) + 84);