staging/keucr: don't use SUCCESS as macro name

Don't use "SUCCESS" as a macro name.  This collides with SCSI's macro
of the same name, but with a different value:

drivers/staging/keucr/smcommon.h:9:9: warning: preprocessor token SUCCESS redefined
include/scsi/scsi.h:463:9: this was the original definition

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>