M28: Fix typo

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Stefano Babic <sbabic@denx.de>

board/denx/m28evk/m28evk.c

@@ -104,7 +104,7 @@ static int m28_mmc_wp(int id)
 
 int board_mmc_init(bd_t *bis)
 {
-	/* Configure WP as output */
+	/* Configure WP as input. */
 	gpio_direction_input(MX28_PAD_AUART2_CTS__GPIO_3_10);
 
 	return mxsmmc_initialize(bis, 0, m28_mmc_wp);