watchdog: bcm281xx: Remove use of seq_printf return value

The seq_printf return value, because it's frequently misused,
will eventually be converted to void.

See: commit 1f33c41c ("seq_file: Rename seq_overflow() to
     seq_has_overflowed() and make public")

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Guenter Roeck <linux~roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>