LU-9077 lnet: fix for static analysis issues

LU-9077 lnet: fix for static analysis issues

fixes the 11 static analysis issues found in
v2_9_52_0-66-gec839d4.

1. lustre_lnet_show_numa_range - fixed
2. lnet_select_pathway - fixed
3. lustre_lnet_show_discovery - fixed
4. lnet_discover_peer_locked - false positive
5. lustre_lnet_ping_nid - fixed
6. lustre_lnet_ping_nid - false positive
7. lustre_lnet_show_discovery - duplicate of 3
8. lustre_lnet_show_max_intf - fixed
9. lustre_lnet_show_max_intf - duplicate of 8
10. lnet_peer_set_primary_data - false positive
11. lustre_lnet_show_numa_range - fixed

Test-Parameters: trivial
Signed-off-by: Sonia Sharma <sonia.sharma@intel.com>
Signed-off-by: Olaf Weber <olaf@sgi.com>
Change-Id: I4cb03e4f64cd0c743ee3646f4628d34533b2d4ba
Reviewed-on: https://review.whamcloud.com/25792
Reviewed-by: Olaf Weber <olaf.weber@hpe.com>
Reviewed-by: Amir Shehata <amir.shehata@intel.com>
Tested-by: Amir Shehata <amir.shehata@intel.com>