[SUNRPC]: Make sure on-stack cmsg buffer is properly aligned.

Based upon a report from Meelis Roos.

Signed-off-by: David S. Miller <[e-mail]>

net/sunrpc/svcsock.c

···
 	struct in_pktinfo pkti;
 	struct in6_pktinfo pkti6;
 };
+#define SVC_PKTINFO_SPACE \
+	CMSG_SPACE(sizeof(union svc_pktinfo_u))
 
 static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh)
 {
···
 	struct svc_sock	*svsk = rqstp->rq_sock;
 	struct socket	*sock = svsk->sk_sock;
 	int		slen;
-	char 		buffer[CMSG_SPACE(sizeof(union svc_pktinfo_u))];
-	struct cmsghdr *cmh = (struct cmsghdr *)buffer;
+	union {
+		struct cmsghdr	hdr;
+		long		all[SVC_PKTINFO_SPACE / sizeof(long)];
+	} buffer;
+	struct cmsghdr *cmh = &buffer.hdr;
 	int		len = 0;
 	int		result;
 	int		size;
···
 	struct svc_sock	*svsk = rqstp->rq_sock;
 	struct svc_serv	*serv = svsk->sk_server;
 	struct sk_buff	*skb;
-	char		buffer[CMSG_SPACE(sizeof(union svc_pktinfo_u))];
-	struct cmsghdr *cmh = (struct cmsghdr *)buffer;
+	union {
+		struct cmsghdr	hdr;
+		long		all[SVC_PKTINFO_SPACE / sizeof(long)];
+	} buffer;
+	struct cmsghdr *cmh = &buffer.hdr;
 	int		err, len;
 	struct msghdr msg = {
 		.msg_name = svc_addr(rqstp),