Input: tests - fix input_test_match_device_id test

Properly initialize input_device_id structure in
input_test_match_device_id test to make sure it contains no garbage
causing the test to randomly fail.

Fixes: fdefcbdd ("Input: Add KUnit tests for some of the input core helper functions")
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/ZFLI7T2qZTGJ1UUK@google.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/tests/input_test.c

@@ -87,7 +87,7 @@ static void input_test_timestamp(struct kunit *test)
 static void input_test_match_device_id(struct kunit *test)
 {
 	struct input_dev *input_dev = test->priv;
-	struct input_device_id id;
+	struct input_device_id id = { 0 };
 
 	/*
 	 * Must match when the input device bus, vendor, product, version