V4L/DVB (8287): sms1xxx: fix WARNING: unnecessary cast may hide bugs

fix the following checkpatch.pl warning:

WARNING: unnecessary cast may hide bugs,
see http://c-faq.com/malloc/mallocnocast.html

596: FILE: linux/drivers/media/dvb/siano/smscoreapi.c:540:
+	msg = (struct SmsMsgHdr_ST *) kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/siano/smscoreapi.c

@@ -489,7 +489,7 @@ int smscore_load_firmware_family2(struct smscore_device_t *coredev,
 	}
 
 	/* PAGE_SIZE buffer shall be enough and dma aligned */
-	msg = (struct SmsMsgHdr_ST *) kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
+	msg = kmalloc(PAGE_SIZE, GFP_KERNEL | GFP_DMA);
 	if (!msg)
 		return -ENOMEM;