Input: fsia6b - suppress buffer truncation warning for phys

Switch the driver to use scnprintf() to avoid warnings about potential
truncation of "phys" field which we can tolerate.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202501020303.1WtxWWTu-lkp@intel.com/
Signed-off-by: Markus Koch <markus@notsyncing.net>
Link: https://lore.kernel.org/r/20250602175710.61583-4-markus@notsyncing.net
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

Author: m42uko

drivers/input/joystick/fsia6b.c

@@ -149,7 +149,7 @@ static int fsia6b_serio_connect(struct serio *serio, struct serio_driver *drv)
 	}
 	fsia6b->dev = input_dev;
 
-	snprintf(fsia6b->phys, sizeof(fsia6b->phys), "%s/input0", serio->phys);
+	scnprintf(fsia6b->phys, sizeof(fsia6b->phys), "%s/input0", serio->phys);
 
 	input_dev->name = DRIVER_DESC;
 	input_dev->phys = fsia6b->phys;