Use the max_rom_decode infrastructure for wbsio_spi

Use this instead of the open-coding variant that only aborts after it is too late.

Corresponding to flashrom svn r1081.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Michael Karcher <flashrom@mkarcher.dialup.fu-berlin.de>
diff --git a/spi.c b/spi.c
index 94dbe9e..9a31abf 100644
--- a/spi.c
+++ b/spi.c
@@ -80,7 +80,7 @@
 		.command = wbsio_spi_send_command,
 		.multicommand = default_spi_send_multicommand,
 		.read = wbsio_spi_read,
-		.write_256 = wbsio_spi_write_1,
+		.write_256 = spi_chip_write_1_new,
 	},
 #endif
 #endif