fix this warning:

fix this warning:
coreboot-v2-4067//src/stream/ide_stream.c: In function 'stream_ide_read':
coreboot-v2-4067//src/stream/ide_stream.c:47: warning: declaration of 'offset' shadows a global declaration
coreboot-v2-4067//src/stream/ide_stream.c:13: warning: shadowed declaration is here

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4071 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1