cbfstool: rename checksum to attributes_offset

So far it's still unused, but its purpose will change:
It will become an offset to another structure that contains additional file
attributes.

This change is compatible because the binary format doesn't change and so far
the field was always set to 0, which can serve nicely as 'unused' field.

Change-Id: I2dafb06866713d43a236556f9492641526270837
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10933
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/util/cbfstool/cbfs.h b/util/cbfstool/cbfs.h
index 85d95f6..f63b881 100644
--- a/util/cbfstool/cbfs.h
+++ b/util/cbfstool/cbfs.h
@@ -77,7 +77,7 @@
 	/* length of file data */
 	uint32_t len;
 	uint32_t type;
-	uint32_t checksum;
+	uint32_t attributes_offset;
 	/* length of header incl. variable data */
 	uint32_t offset;
 	char filename[];
diff --git a/util/cbfstool/cbfs_image.c b/util/cbfstool/cbfs_image.c
index 793a9aa..6e040bf 100644
--- a/util/cbfstool/cbfs_image.c
+++ b/util/cbfstool/cbfs_image.c
@@ -1032,7 +1032,7 @@
 	memcpy(entry->magic, CBFS_FILE_MAGIC, sizeof(entry->magic));
 	entry->type = htonl(CBFS_COMPONENT_NULL);
 	entry->len = htonl(len);
-	entry->checksum = 0;  // TODO Build a checksum algorithm.
+	entry->attributes_offset = 0;
 	entry->offset = htonl(cbfs_calculate_file_header_size(name));
 	memset(entry->filename, 0, ntohl(entry->offset) - sizeof(*entry));
 	strcpy(entry->filename, name);
diff --git a/util/cbfstool/common.c b/util/cbfstool/common.c
index fffd096..d72db38 100644
--- a/util/cbfstool/common.c
+++ b/util/cbfstool/common.c
@@ -131,7 +131,7 @@
 	bgets(buf, &file->magic, sizeof(file->magic));
 	file->len = xdr_be.get32(buf);
 	file->type = xdr_be.get32(buf);
-	file->checksum = xdr_be.get32(buf);
+	file->attributes_offset = xdr_be.get32(buf);
 	file->offset = xdr_be.get32(buf);
 }