staging: wilc1000: use sizeof(variable) for memory allocated to store key info

Changes to fix below checkpatch reported issues.

CHECK: Prefer kmalloc(sizeof(*priv->wilc_gtk[idx])...) over
kmalloc(sizeof(struct wilc_wfi_key)...)

CHECK: Prefer kmalloc(sizeof(*priv->wilc_ptk[idx])...) over
kmalloc(sizeof(struct wilc_wfi_key)...)
Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_wfi_cfgoperations.c

@@ -870,15 +870,15 @@ static inline void wilc_wfi_cfg_copy_wep_info(struct wilc_priv *priv,
 static int wilc_wfi_cfg_allocate_wpa_entry(struct wilc_priv *priv, u8 idx)
 {
 	if (!priv->wilc_gtk[idx]) {
-		priv->wilc_gtk[idx] = kzalloc(sizeof(struct wilc_wfi_key),
-					       GFP_KERNEL);
+		priv->wilc_gtk[idx] = kzalloc(sizeof(*priv->wilc_gtk[idx]),
+					      GFP_KERNEL);
 		if (!priv->wilc_gtk[idx])
 			return -ENOMEM;
 	}
 
 	if (!priv->wilc_ptk[idx]) {
-		priv->wilc_ptk[idx] = kzalloc(sizeof(struct wilc_wfi_key),
-					       GFP_KERNEL);
+		priv->wilc_ptk[idx] = kzalloc(sizeof(*priv->wilc_ptk[idx]),
+					      GFP_KERNEL);
 		if (!priv->wilc_ptk[idx])
 			return -ENOMEM;
 	}