HID: intel-thc: make ptl_ddata static

ptl_ddata is local to pci-quicki2c.c, so it'd better be static.

Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/intel-thc-hid/intel-quicki2c/pci-quicki2c.c

···
 #include "quicki2c-hid.h"
 #include "quicki2c-protocol.h"
 
-struct quicki2c_ddata ptl_ddata = {
+static struct quicki2c_ddata ptl_ddata = {
 	.max_detect_size = MAX_RX_DETECT_SIZE_PTL,
 };