meta-ampere: fix up new shellcheck warnings

New docker container is flagging some issues in this shell script:

```
Command appears to be unreachable. Check usage (or ignore if invoked indirectly)
```

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I1a64d3d6663812bfde2404fded05cfcae7b81a1c
diff --git a/meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere_gpio_utils.sh b/meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere_gpio_utils.sh
index 28c67b5..ff8c7c9 100644
--- a/meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere_gpio_utils.sh
+++ b/meta-ampere/meta-jade/recipes-ampere/platform/mtjade-gpio-config/ampere_gpio_utils.sh
@@ -40,5 +40,4 @@
 	echo "Invalid parameter1=$1"
 	usage;
 	exit 0;
-fi
-exit 0;
+fi
\ No newline at end of file