util/nvramtool: Bail out on unaligned multi-byte entries

coreboot doesn't support CMOS options that are not byte aligned but
span multiple bytes. So treat them as error.

Change-Id: I2bcff62f153932e9c6646b4ce08e8da1c1532947
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/18246
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

util/nvramtool/accessors/layout-text.c

@@ -695,6 +695,12 @@ static void try_add_layout_file_entry(const cmos_entry_t * cmos_entry)
 		 */
 		return;
 
+	case LAYOUT_MULTIBYTE_ENTRY_NOT_ALIGNED:
+		fprintf(stderr,
+			"%s: Unaligned CMOS option table entry %s "
+			"spans multiple bytes.\n", prog_name, cmos_entry->name);
+		break;
+
 	default:
 		BUG();
 	}