[PATCH net-next] net: ena: make symbol 'ena_alloc_map_page' static

The sparse tool complains as follows:

drivers/net/ethernet/amazon/ena/ena_netdev.c:978:13: warning:
 symbol 'ena_alloc_map_page' was not declared. Should it be static?

This symbol is not used outside of ena_netdev.c, so marks it static.

Fixes: 947c54c395cb ("net: ena: Use dev_alloc() in RX buffer allocation")
Reported-by: Hulk Robot <redacted>
Signed-off-by: Wei Yongjun <redacted>
---
 drivers/net/ethernet/amazon/ena/ena_netdev.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index cd6ea59c543c..3bb0e66b2c7e 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c

@@ -975,7 +975,8 @@ static void ena_free_all_io_rx_resources(struct ena_adapter *adapter)
 		ena_free_rx_resources(adapter, i);
 }
 
-struct page *ena_alloc_map_page(struct ena_ring *rx_ring, dma_addr_t *dma)
+static struct page *ena_alloc_map_page(struct ena_ring *rx_ring,
+				       dma_addr_t *dma)
 {
 	struct page *page;