[ZSH] Fix autopull

zsh/.zshrc

@@ -19,16 +19,15 @@ if [[ -f ~/.zsh/.shared_config ]] ; then
     touch ~/.config/nvim/.shared_config
 fi
 
-function update_dotfiles () {
-    cd ~/dotfiles
-    fetch=$(git fetch)
-    if [[ -n "$fetch" ]]; then
-        git pull 2>& 1 > /dev/null
+update_dotfiles() {
+    cd ~/dotfiles || return
+    if git fetch --dry-run 2>&1 | grep -q .; then
+        git pull > /dev/null 2>&1
     fi
 }
 
-if [ $shared_config -eq 0 ]; then
-    update_dotfiles &| 
+if [ "$shared_config" -eq 0 ]; then
+    update_dotfiles 2>&1 &!
 fi