RDMA/core: fix spelling mistake "Nelink" -> "Netlink"

There is a spelling mistake in a warning message, fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Link: https://lore.kernel.org/r/20190731080144.18327-1-colin.king@canonical.comSigned-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/core/netlink.c

@@ -303,7 +303,7 @@ void rdma_nl_exit(void)
 
 	for (idx = 0; idx < RDMA_NL_NUM_CLIENTS; idx++)
 		WARN(rdma_nl_types[idx].cb_table,
-		     "Nelink client %d wasn't released prior to unloading %s\n",
+		     "Netlink client %d wasn't released prior to unloading %s\n",
 		     idx, KBUILD_MODNAME);
 }