gpio: Correct handling of 'gpio status'

This is broken - we need to look at the first two characters to distinguish
'gpio status' from 'gpio set'.

Fixes: 0ffe6ab5 (gpio: Allow 's' as an abbreviation for 'status')
Reported-by: Soeren Moch <smoch@web.de>
Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Soeren Moch <smoch@web.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Hannes Schmelzer <oe5hpm@oevsv.at>
diff --git a/cmd/gpio.c b/cmd/gpio.c
index 2b78b16..693998e 100644
--- a/cmd/gpio.c
+++ b/cmd/gpio.c
@@ -141,7 +141,7 @@
 #endif
 	if (argc > 0)
 		str_gpio = *argv;
-	if (!strncmp(str_cmd, "status", 1)) {
+	if (!strncmp(str_cmd, "status", 2)) {
 		/* Support deprecated gpio_status() */
 #ifdef gpio_status
 		gpio_status();