cbfstool: don't pass header_size as separate argument (part 2)

It's already present inside struct cbfs_file

Change-Id: Ic9682e93c3d208e2ed458940e4a9f9f5a64b6e98
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/11333
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/util/cbfstool/cbfs_image.c b/util/cbfstool/cbfs_image.c
index f93cfef..315cbe5 100644
--- a/util/cbfstool/cbfs_image.c
+++ b/util/cbfstool/cbfs_image.c
@@ -533,7 +533,7 @@
 
 int cbfs_add_entry(struct cbfs_image *image, struct buffer *buffer,
 		   uint32_t content_offset,
-		   struct cbfs_file *header, uint32_t header_size)
+		   struct cbfs_file *header)
 {
 	assert(image);
 	assert(buffer);
@@ -546,6 +546,7 @@
 	uint32_t addr, addr_next;
 	struct cbfs_file *entry, *next;
 	uint32_t need_size;
+	uint32_t header_size = ntohl(header->offset);
 
 	need_size = header_size + buffer->size;
 	DEBUG("cbfs_add_entry('%s'@0x%x) => need_size = %u+%zu=%u\n",