fm10k: remove needless initialization of size local variable

The local variable 'size' in fm10k_dfwd_add_station is initialized, but
is always re-assigned immediately before use. Remove this unnecessary
initialization.

This was detected by cppcheck and resolves the following warning
produced by that tool:

[fm10k_netdev.c:1466]: (style) Variable 'size' is assigned a value that is never used.
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/fm10k/fm10k_netdev.c

@@ -1463,7 +1463,7 @@ static void *fm10k_dfwd_add_station(struct net_device *dev,
 	struct fm10k_l2_accel *old_l2_accel = NULL;
 	struct fm10k_dglort_cfg dglort = { 0 };
 	struct fm10k_hw *hw = &interface->hw;
-	int size = 0, i;
+	int size, i;
 	u16 vid, glort;
 
 	/* The hardware supported by fm10k only filters on the destination MAC