LU-15149 lnet: Missing newline in lnet_add_route

LU-15149 lnet: Missing newline in lnet_add_route

CWARN string is missing a newline character.

Test-Parameters: trivial
Fixes: 3f2844dc93 ("LU-14945 lnet: don't use hops to determine the route state")
Signed-off-by: Chris Horn <chris.horn@hpe.com>
Change-Id: I06370c36e9d88b7e02e000bfb573297ff281aef1
Reviewed-on: https://review.whamcloud.com/45340
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>