shell/caucase.sh: Remove return value when it is "$?".

Is no value is provided to a return statement, the status of the last
command ran is returned, making "$?" superfluous.

shell/caucase.sh

@@ -59,7 +59,7 @@ forEachJSONListItem () {
   local list index
   list="$(cat)"
   for index in $(seq 0 $(($(printf '%s\n' "$list" | jq length) - 1))); do
-    printf '%s\n' "$list" | jq ".[$index]" | "$@" || return $?
+    printf '%s\n' "$list" | jq ".[$index]" | "$@" || return
   done
 }
 
@@ -236,7 +236,7 @@ _forEachPEM () {
     case "$line" in
       '-----END '*'-----')
         if "$tester" "$line"; then
-          printf '%s\n' "$current" | "$@" || return $?
+          printf '%s\n' "$current" | "$@" || return
         fi
         current=''
         ;;