staging: ft1000: dont cast void* from kmalloc()

Casting (void *) value returned by kmalloc is useless
 as mentioned in Documentation/CodingStyle, Chap 14.

 The semantic patch that makes this output is available
 in scripts/coccinelle/api/alloc/drop_kmalloc_cast.cocci.

 More information about semantic patching is available at
 http://coccinelle.lip6.fr/

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/ft1000/ft1000-usb/ft1000_hw.c

@@ -485,7 +485,7 @@ void card_send_command(struct ft1000_device *ft1000dev, void *ptempbuffer,
 
 	DEBUG("card_send_command: enter card_send_command... size=%d\n", size);
 
-	commandbuf = (unsigned char *)kmalloc(size + 2, GFP_KERNEL);
+	commandbuf = kmalloc(size + 2, GFP_KERNEL);
 	memcpy((void *)commandbuf + 2, (void *)ptempbuffer, size);
 
 	ft1000_read_register(ft1000dev, &temp, FT1000_REG_DOORBELL);