Replace strncpy() with strscpy(), fixes the following warning:

In function 'bearer_name_validate',
    inlined from 'tipc_enable_bearer' at net/tipc/bearer.c:246:7:
net/tipc/bearer.c:141:2: warning: 'strncpy' specified bound 32 equals destination size [-Wstringop-truncation]
  strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Wenlin Kang <wenlin.kang@windriver.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Link: https://lore.kernel.org/r/20201112093442.8132-1-wenlin.kang@windriver.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>