libmnl: fix valgrind warnings about padding

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When using  mnl_nlmsg_put_extra_header() it pads out the addtional
header but only zeros the original size not the padded value. Which
cause valgrind to complain about sendto() with unitialized byte.

--- a/src/nlmsg.c
+++ b/src/nlmsg.c
@@ -105,8 +105,9 @@ void *
 mnl_nlmsg_put_extra_header(struct nlmsghdr *nlh, size_t size)
        char *ptr = (char *)nlh + nlh->nlmsg_len;
-       nlh->nlmsg_len += MNL_ALIGN(size);
-       memset(ptr, 0, size);
+       size_t len = MNL_ALIGN(size);
+       nlh->nlmsg_len += len;
+       memset(ptr, 0, len);
        return ptr;

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