pinctrl: amd: Fix an unused variable

`char *output_enable` is no longer used once switching to unicode
output.

Fixes: e8129a0 ("pinctrl: amd: Use unicode for debugfs output")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20220801144952.141-1-mario.limonciello@amd.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Author: superm1

drivers/pinctrl/pinctrl-amd.c

@@ -216,7 +216,6 @@ static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
 	char *pull_up_enable;
 	char *pull_down_enable;
 	char *orientation;
-	char *output_enable;
 	char debounce_value[40];
 	char *debounce_enable;