staging: gdm72xx: use kzalloc to allocate usb_tx structure

the code under alloc_tx_struct does the allocation of usb_tx structure
using kmalloc, and memsets the allocated pointer, instead we can
directly use kzalloc so that the allocated memory is set with
zeros
Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gdm72xx/gdm_sdio.c

@@ -62,12 +62,10 @@ static struct sdio_tx *alloc_tx_struct(struct tx_cxt *tx)
 {
 	struct sdio_tx *t = NULL;
 
-	t = kmalloc(sizeof(*t), GFP_ATOMIC);
+	t = kzalloc(sizeof(*t), GFP_ATOMIC);
 	if (t == NULL)
 		goto out;
 
-	memset(t, 0, sizeof(*t));
-
 	t->buf = kmalloc(TX_BUF_SIZE, GFP_ATOMIC);
 	if (t->buf == NULL)
 		goto out;

drivers/staging/gdm72xx/gdm_usb.c

@@ -75,12 +75,10 @@ static struct usb_tx *alloc_tx_struct(struct tx_cxt *tx)
 {
 	struct usb_tx *t = NULL;
 
-	t = kmalloc(sizeof(*t), GFP_ATOMIC);
+	t = kzalloc(sizeof(*t), GFP_ATOMIC);
 	if (t == NULL)
 		goto out;
 
-	memset(t, 0, sizeof(*t));
-
 	t->urb = usb_alloc_urb(0, GFP_ATOMIC);
 	t->buf = kmalloc(TX_BUF_SIZE, GFP_ATOMIC);
 	if (t->urb == NULL || t->buf == NULL)