add missing "return 0"

powerlevel9k.zsh-theme

@@ -2333,6 +2333,7 @@ function _p9k_prompt_overflow_bug() {
   [[ $ZSH_PATCHLEVEL =~ '^zsh-5\.4\.2-([0-9]+)-' ]] && return $(( match[1] < 159 ))
   is-at-least 5.7.2 && return 1
   [[ $ZSH_PATCHLEVEL =~ '^zsh-5\.7\.1-([0-9]+)-' ]] && return $(( match[1] >= 50 ))
+  return 0
 }
 
 # Some people write POWERLEVEL9K_DIR_PATH_SEPARATOR='\uNNNN' instead of