igb: Replace GFP_ATOMIC with GFP_KERNEL in igb_sw_init()

igb_sw_init() is never called in atomic context.
It calls kzalloc() and kcalloc() with GFP_ATOMIC, which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.

This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/igb/igb_main.c

@@ -3873,7 +3873,7 @@ static int igb_sw_init(struct igb_adapter *adapter)
 
 	adapter->mac_table = kcalloc(hw->mac.rar_entry_count,
 				     sizeof(struct igb_mac_addr),
-				     GFP_ATOMIC);
+				     GFP_KERNEL);
 	if (!adapter->mac_table)
 		return -ENOMEM;
 
@@ -3883,7 +3883,7 @@ static int igb_sw_init(struct igb_adapter *adapter)
 
 	/* Setup and initialize a copy of the hw vlan table array */
 	adapter->shadow_vfta = kcalloc(E1000_VLAN_FILTER_TBL_SIZE, sizeof(u32),
-				       GFP_ATOMIC);
+				       GFP_KERNEL);
 	if (!adapter->shadow_vfta)
 		return -ENOMEM;