security: Fix some typos and potential NULL-deref

This patch against the git tree fixes minor typos, some of them possibily
leading to NULL-pointer dereference in rare conditions.

Signed-off-by: Remi Gacogne <rgacogne-github@coredump.fr>
Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
Acked-by: Feng Lu <lu.feng@6wind.com>
diff --git a/ospf6d/ospf6_snmp.c b/ospf6d/ospf6_snmp.c
index f8a3b92..4660392 100644
--- a/ospf6d/ospf6_snmp.c
+++ b/ospf6d/ospf6_snmp.c
@@ -528,7 +528,7 @@
     return NULL;
 
   len = *length - v->namelen;
-  len = (len >= 1 ? sizeof 1 : 0);
+  len = (len >= 1 ? 1 : 0);
   if (exact && len != 1)
     return NULL;
   if (len)