sfc: Make buffer table indices and counts consistently unsigned

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

drivers/net/ethernet/sfc/net_driver.h

@@ -81,8 +81,8 @@ struct efx_special_buffer {
 	void *addr;
 	dma_addr_t dma_addr;
 	unsigned int len;
-	int index;
-	int entries;
+	unsigned int index;
+	unsigned int entries;
 };
 
 /**

drivers/net/ethernet/sfc/nic.c

@@ -192,7 +192,7 @@ static void
 efx_init_special_buffer(struct efx_nic *efx, struct efx_special_buffer *buffer)
 {
 	efx_qword_t buf_desc;
-	int index;
+	unsigned int index;
 	dma_addr_t dma_addr;
 	int i;