tegra: make local functions static

Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
diff --git a/drivers/input/tegra-kbc.c b/drivers/input/tegra-kbc.c
index 7e36db0..0ef94f7 100644
--- a/drivers/input/tegra-kbc.c
+++ b/drivers/input/tegra-kbc.c
@@ -181,7 +181,7 @@
  * @param input		Input configuration
  * @return 1, to indicate that we have something to look at
  */
-int tegra_kbc_check(struct input_config *input)
+static int tegra_kbc_check(struct input_config *input)
 {
 	kbd_wait_for_fifo_init(&config);
 	check_for_keys(&config);