greybus: manifest: Account for padding in string descriptor

String descriptors are padded towards the end to align them to 4 byte
boundaries. Take that into account while calculating expected size.
Reviewed-by: Alex Elder <elder@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/manifest.c

@@ -100,6 +100,9 @@ static int identify_descriptor(struct gb_interface *intf,
 	case GREYBUS_TYPE_STRING:
 		expected_size += sizeof(struct greybus_descriptor_string);
 		expected_size += desc->string.length;
+
+		/* String descriptors are padded to 4 byte boundaries */
+		expected_size = ALIGN(expected_size, 4);
 		break;
 	case GREYBUS_TYPE_INTERFACE:
 		expected_size += sizeof(struct greybus_descriptor_interface);