HID: make hid_input_field and usbhid_modify_dquirk static

This patch makes the following needlessly global functions static:
- hid-core.c:hid_input_field()
- usbhid/hid-quirks.c:usbhid_modify_dquirk()

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 10f925b..e03c67d 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -830,7 +830,8 @@
  * reporting to the layer).
  */
 
-void hid_input_field(struct hid_device *hid, struct hid_field *field, __u8 *data, int interrupt)
+static void hid_input_field(struct hid_device *hid, struct hid_field *field,
+			    __u8 *data, int interrupt)
 {
 	unsigned n;
 	unsigned count = field->report_count;
@@ -876,7 +877,6 @@
 exit:
 	kfree(value);
 }
-EXPORT_SYMBOL_GPL(hid_input_field);
 
 /*
  * Output the field into the report.