check-all.c: remove double '\n'

Change-Id: If23983247bfc43554e2396beaf6ed743ab0c05ed
Reviewed-on: http://review.couchbase.org/28259
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>