forgot to rename one variable

plugins/bundler-exec/bundler-exec.plugin.zsh

@@ -15,7 +15,7 @@ _within-bundled-project()
     local check_dir=$PWD
     while [ "$(dirname $check_dir)" != "/" ]; do
         [ -f "$check_dir/Gemfile" ] && return
-        dir="$(dirname $check_dir)"
+        check_dir="$(dirname $check_dir)"
     done
     false
 }