fixed introduced to parse_git_dirty

lib/git.zsh

@@ -8,7 +8,7 @@ function git_prompt_info() {
 # Checks if working tree is dirty
 parse_git_dirty() {
   local SUBMODULE_SYNTAX=''
-  if [[ POST_1_7_2_GIT -gt 0 ]]; then
+  if [[ $POST_1_7_2_GIT -gt 0 ]]; then
         SUBMODULE_SYNTAX="--ignore-submodules=dirty"
   fi
   if [[ -n $(git status -s ${SUBMODULE_SYNTAX}  2> /dev/null) ]]; then