drivers/intel/fsp1_1: Fix vbt_len type

Type of vbt_len should be size_t, change to fix compiler error

Change-Id: I22798fa0edb98fcb9acc1b2dd52f34a61bc511e9
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/27224
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
diff --git a/src/drivers/intel/fsp1_1/vbt.c b/src/drivers/intel/fsp1_1/vbt.c
index b73d3a2..b6bb308 100644
--- a/src/drivers/intel/fsp1_1/vbt.c
+++ b/src/drivers/intel/fsp1_1/vbt.c
@@ -26,7 +26,7 @@
 void load_vbt(uint8_t s3_resume, SILICON_INIT_UPD *params)
 {
 	const optionrom_vbt_t *vbt_data = NULL;
-	uint32_t vbt_len;
+	size_t vbt_len;
 
 	/* Check boot mode - for S3 resume path VBT loading is not needed */
 	if (s3_resume) {