net/mlx5: Use unsigned int for free_count

Fix the warning due to missing int.

WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
+       unsigned free_count;
Signed-off-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>

drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c

@@ -61,7 +61,7 @@ struct fw_page {
 	u32			function;
 	unsigned long		bitmask;
 	struct list_head	list;
-	unsigned		free_count;
+	unsigned int free_count;
 };
 
 enum {