fix: minor tweaks to be shellcheck comply

dotbare.plugin.bash

@@ -5,7 +5,7 @@ mydir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 __dotbare_completion()
 {
-  local IFS=$'\n' subcommands curr prev options selected suggestions
+  local IFS=$'\n' subcommands curr prev options suggestions
   curr="${COMP_WORDS[$COMP_CWORD]}"
   prev="${COMP_WORDS[$COMP_CWORD-1]}"
 

helper/git_query.sh

@@ -203,7 +203,7 @@ function get_stash() {
 function grep_lines() {
   local header="${1:-select lines to edit}"
   set_fzf_multi "$2"
-  cd "${DOTBARE_TREE}"
+  cd "${DOTBARE_TREE}" || exit
   git --git-dir="${DOTBARE_DIR}" --work-tree="${DOTBARE_TREE}" \
     grep --line-number -- . \
     | fzf --delimiter : --nth 3.. --header="${header}" \