HID: hid-debug.c should #include <linux/hid-debug.h>

Every file should include the headers containing the prototypes for
it's global functions.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
index 89241be..83c4126 100644
--- a/drivers/hid/hid-debug.c
+++ b/drivers/hid/hid-debug.c
@@ -29,6 +29,7 @@
  */
 
 #include <linux/hid.h>
+#include <linux/hid-debug.h>
 
 struct hid_usage_entry {
 	unsigned  page;