corrected a problem in dir_init() w/older bashes

Changed an implicit array reference to DI_OUTPUT to an explicit one.
Also made a potential error message declare its origin.

src/usr/sbin/sbopkg

@@ -282,7 +282,7 @@ dir_init() {
             DI_OUTPUT+=( "${DI_OUTPUT_LINES[$i]}" )
         fi
     done
-    if [[ $DI_OUTPUT ]]; then
+    if [[ ${DI_OUTPUT[*]} ]]; then
         # Keep DI_OUTPUT_LINES and the 'table headers' aligned, too.
         cat << EOF
 
@@ -324,7 +324,7 @@ EOF
 
     for ((i=0; i<${#DIR_VARS[*]}; i++)); do
         if [ ! -w ${DIR_VARS[$i]} ]; then
-            echo ${DIR_VARS[$i]} not writable
+            echo $SCRIPT: ${DIR_VARS[$i]} not writable
             ERROR=nowrite
         fi
     done