hyperv: fix sparse warnings

this patch fixes following sparse warnings:

netvsc.c:688:5: warning: symbol 'netvsc_copy_to_send_buf' was not declared. Should it be static?
rndis_filter.c:627:5: warning: symbol 'rndis_filter_set_offload_params' was not declared. Should it be static?
rndis_filter.c:702:5: warning: symbol 'rndis_filter_set_rss_param' was not declared. Should it be static?
Signed-off-by: NLad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: NHaiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/hyperv/netvsc.c

@@ -685,9 +685,9 @@ static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
 	return ret_val;
 }
 
-u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
-			    unsigned int section_index,
-			    struct hv_netvsc_packet *packet)
+static u32 netvsc_copy_to_send_buf(struct netvsc_device *net_device,
+				   unsigned int section_index,
+				   struct hv_netvsc_packet *packet)
 {
 	char *start = net_device->send_buf;
 	char *dest = (start + (section_index * net_device->send_section_size));

drivers/net/hyperv/rndis_filter.c

@@ -624,7 +624,8 @@ int rndis_filter_set_device_mac(struct hv_device *hdev, char *mac)
 	return ret;
 }
 
-int rndis_filter_set_offload_params(struct hv_device *hdev,
+static int
+rndis_filter_set_offload_params(struct hv_device *hdev,
 				struct ndis_offload_params *req_offloads)
 {
 	struct netvsc_device *nvdev = hv_get_drvdata(hdev);
@@ -699,7 +700,7 @@ u8 netvsc_hash_key[HASH_KEYLEN] = {
 	0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa
 };
 
-int rndis_filter_set_rss_param(struct rndis_device *rdev, int num_queue)
+static int rndis_filter_set_rss_param(struct rndis_device *rdev, int num_queue)
 {
 	struct net_device *ndev = rdev->net_dev->ndev;
 	struct rndis_request *request;