cbfstool: Fix leak in cbfs_image struct initialization

This patches a memory leak on every struct cbfs_image creation that
was introduced by c1d1fd850e. Since that
commit, the CBFS master header has been copied to a separate buffer so
that its endianness could be fixed all at once; unfortunately, this
buffer was malloc()'d but never free()'d. To address the issue, we
replace the structure's struct cbfs_header * with a struct cbfs_header
to eliminate the additional allocation.

Change-Id: Ie066c6d4b80ad452b366a2a95092ed45aa55d91f
Signed-off-by: Sol Boucher <solb@chromium.org>
Reviewed-on: http://review.coreboot.org/10130
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/cbfstool/cbfstool.c

@@ -465,7 +465,7 @@ static int cbfs_locate(void)
 	}
 
 	if (param.top_aligned)
-		address = address - image.header->romsize;
+		address = address - image.header.romsize;
 
 	cbfs_image_delete(&image);
 	printf("0x%x\n", address);