wifi: ipw2x00: Use kzalloc() instead of kmalloc()/memset()

Replace kmalloc() + memset() to kzalloc() for
better code readability and simplicity.
Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://patch.msgid.link/20240704090622.2260102-1-nichen@iscas.ac.cn

drivers/net/wireless/intel/ipw2x00/libipw_tx.c

@@ -180,11 +180,10 @@ static struct libipw_txb *libipw_alloc_txb(int nr_frags, int txb_size,
 	struct libipw_txb *txb;
 	int i;
 
-	txb = kmalloc(struct_size(txb, fragments, nr_frags), gfp_mask);
+	txb = kzalloc(struct_size(txb, fragments, nr_frags), gfp_mask);
 	if (!txb)
 		return NULL;
 
-	memset(txb, 0, sizeof(struct libipw_txb));
 	txb->nr_frags = nr_frags;
 	txb->frag_size = txb_size;