more error checking

git-svn-id: svn://10.0.0.236/trunk@206315 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/testing/release/updates/verify_update.sh

@@ -20,10 +20,15 @@ check_update () {
     rm -rf target/*
 
     unpack_build $platform source "$source_package" 
+    if [ "$?" != "0" ]; then
+      echo "FAILED: cannot unpack_build $platform source $source_package"
+      return 1
+    fi
     unpack_build $platform target "$target_package" 
-    
-    #mkdir update
-    #cp $update_package update/update.mar
+    if [ "$?" != "0" ]; then
+      echo "FAILED: cannot unpack_build $platform target $target_package"
+      return 1
+    fi
     
     case $platform in
         mac|mac-ppc)