Input: aiptek - replace GFP_ATOMIC with GFP_KERNEL in aiptek_probe()

aiptek_probe() is never called in atomic context. It calls
usb_alloc_coherent() with GFP_ATOMIC, which is not necessary. GFP_ATOMIC
can be replaced with GFP_KERNEL.

This is found by a static analysis tool named DCNS written by myself.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/tablet/aiptek.c

@@ -1712,7 +1712,7 @@ aiptek_probe(struct usb_interface *intf, const struct usb_device_id *id)
         }
 
 	aiptek->data = usb_alloc_coherent(usbdev, AIPTEK_PACKET_LENGTH,
-					  GFP_ATOMIC, &aiptek->data_dma);
+					  GFP_KERNEL, &aiptek->data_dma);
         if (!aiptek->data) {
 		dev_warn(&intf->dev, "cannot allocate usb buffer\n");
 		goto fail1;