bash: fix git-script linter errors

Signed-off-by: Michael Grote <michael.grote@posteo.de>

scripts/git_delete_all_branches.sh

@@ -1,2 +1,3 @@
 #!/bin/bash
+# shellcheck disable=SC2063
 git branch | grep -v "*" | grep -v master | grep -v main | xargs git branch -D ; git fetch --prune

scripts/git_pull_all.sh

@@ -13,13 +13,14 @@ function update {
     if [ -e "$d/.ignore" ]; then
       echo -e "\n${HIGHLIGHT}Ignoring $d${NORMAL}"
       else
-      cd $d > /dev/null
+      cd "$d" || exit > /dev/null
       if [ -d ".git" ]; then
         echo -e "\n${HIGHLIGHT}Updating pwd$NORMAL"
         git add .
         git stash
         git pull
       else
+        # shellcheck disable=SC2035
         scan *
       fi
     cd .. > /dev/null
@@ -30,12 +31,13 @@ function update {
 
 function scan {
   #echo "pwd"
-  for x in $*; do
+  for x in "$@"; do
     update "$x"
   done
 }
 
-if [ "$1" != "" ]; then cd $1 > /dev/null; fi
+if [ "$1" != "" ]; then cd "$1" || exit > /dev/null; fi
 
 echo -e "${HIGHLIGHT}Scanning ${PWD}${NORMAL}"
+# shellcheck disable=SC2035
 scan *