Fix a bogon in the previous commit. When suppressing multiple isab

devices, we have to allow for the case when the isab0 device is ourselves.

Tested by:	markm

sys/dev/acpica/acpi_isab.c

@@ -94,7 +94,7 @@ acpi_isab_probe(device_t dev)
 
 	if ((acpi_get_type(dev) == ACPI_TYPE_DEVICE) &&
 	    !acpi_disabled("isa") &&
-	    devclass_get_device(isab_devclass, 0) == NULL &&
+	    devclass_get_device(isab_devclass, 0) == dev &&
 	    (acpi_MatchHid(dev, "PNP0A05") || acpi_MatchHid(dev, "PNP0A06"))) {
 		device_set_desc(dev, "ACPI Generic ISA bridge");
 		return(0);