Update valgrind suppressions

Socket/Protocols/Raw/LLAddressing.cc

@@ -47,6 +47,7 @@ prefix_ std::string senf::LLSocketAddress::interface()
     if (addr_.sll_ifindex == 0)
         return std::string();
     char name[IFNAMSIZ];
+    ::bzero(name, IFNAMSIZ);
     if (! ::if_indextoname(addr_.sll_ifindex, name))
         throw AddressSyntaxException();
     return std::string(name);

valgrind.sup

@@ -101,3 +101,10 @@
    Memcheck:Cond
    fun:inet_ntop
 }
+
+{
+   if_indextoname-suppression-1
+   Memcheck:Param
+   ioctl(SIOCGIFINDEX)
+   obj:/lib/ld-2.3.6.so
+}