usb: core: Make use of acpi_evaluate_object() status

Compiler is not happy about dangling variable:

.../core/usb-acpi.c: In function ‘usb_acpi_get_connect_type’:
.../core/usb-acpi.c:90:14: warning: variable ‘status’ set but not used [-Wunused-but-set-variable]
   90 |  acpi_status status;
      |              ^~~~~~

Make use of it by checking the status and bail out in case of error.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200218185207.62527-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/usb-acpi.c

@@ -86,7 +86,7 @@ static enum usb_port_connect_type usb_acpi_get_connect_type(acpi_handle handle,
 {
 	enum usb_port_connect_type connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN;
 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
-	union acpi_object *upc;
+	union acpi_object *upc = NULL;
 	acpi_status status;
 
 	/*
@@ -98,11 +98,12 @@ static enum usb_port_connect_type usb_acpi_get_connect_type(acpi_handle handle,
 	 * no connectable, the port would be not used.
 	 */
 	status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer);
+	if (ACPI_FAILURE(status))
+		goto out;
+
 	upc = buffer.pointer;
-	if (!upc || (upc->type != ACPI_TYPE_PACKAGE)
-		|| upc->package.count != 4) {
+	if (!upc || (upc->type != ACPI_TYPE_PACKAGE) || upc->package.count != 4)
 		goto out;
-	}
 
 	if (upc->package.elements[0].integer.value)
 		if (pld->user_visible)