HID: i2c-hid: remove superfluous include

The pointless WARN_ON() has been removed from i2c_hid_remove(),
so we don't need bug.h any more.
Reported-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/i2c-hid/i2c-hid.c

@@ -32,7 +32,6 @@
 #include <linux/list.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
-#include <linux/bug.h>
 #include <linux/hid.h>
 
 #include <linux/i2c/i2c-hid.h>