Bluetooth: Use kzalloc for drivers

Use kzalloc rather than the combination of kmalloc and memset.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,size,flags;
statement S;
@@

-x = kmalloc(size,flags);
+x = kzalloc(size,flags);
 if (x == NULL) S
-memset(x, 0, size);
// </smpl>
Signed-off-by: Julia Lawall <julia@diku.dk>
Acked-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btmrvl_sdio.c

@@ -217,7 +217,7 @@ static int btmrvl_sdio_download_helper(struct btmrvl_sdio_card *card)
 
 	tmphlprbufsz = ALIGN_SZ(BTM_UPLD_SIZE, BTSDIO_DMA_ALIGN);
 
-	tmphlprbuf = kmalloc(tmphlprbufsz, GFP_KERNEL);
+	tmphlprbuf = kzalloc(tmphlprbufsz, GFP_KERNEL);
 	if (!tmphlprbuf) {
 		BT_ERR("Unable to allocate buffer for helper."
 			" Terminating download");
@@ -225,8 +225,6 @@ static int btmrvl_sdio_download_helper(struct btmrvl_sdio_card *card)
 		goto done;
 	}
 
-	memset(tmphlprbuf, 0, tmphlprbufsz);
-
 	helperbuf = (u8 *) ALIGN_ADDR(tmphlprbuf, BTSDIO_DMA_ALIGN);
 
 	/* Perform helper data transfer */
@@ -319,7 +317,7 @@ static int btmrvl_sdio_download_fw_w_helper(struct btmrvl_sdio_card *card)
 	BT_DBG("Downloading FW image (%d bytes)", firmwarelen);
 
 	tmpfwbufsz = ALIGN_SZ(BTM_UPLD_SIZE, BTSDIO_DMA_ALIGN);
-	tmpfwbuf = kmalloc(tmpfwbufsz, GFP_KERNEL);
+	tmpfwbuf = kzalloc(tmpfwbufsz, GFP_KERNEL);
 	if (!tmpfwbuf) {
 		BT_ERR("Unable to allocate buffer for firmware."
 		       " Terminating download");
@@ -327,8 +325,6 @@ static int btmrvl_sdio_download_fw_w_helper(struct btmrvl_sdio_card *card)
 		goto done;
 	}
 
-	memset(tmpfwbuf, 0, tmpfwbufsz);
-
 	/* Ensure aligned firmware buffer */
 	fwbuf = (u8 *) ALIGN_ADDR(tmpfwbuf, BTSDIO_DMA_ALIGN);