shutils: fix read_tree_values

My bash fu was off on my previous list. The output of find was being
treated as a single string, rather than an array of paths; which ment
that the test that there was more than one path returned failed,
resulting in null output not just for empty directories but for
everyting.

This fixes the issue by converting find output to an array.

devlib/bin/scripts/shutils.in

@@ -221,9 +221,9 @@ read_tree_values() {
         exit 1
     fi
 
-    PATHS=$($BUSYBOX find $PATH -follow -maxdepth $MAXDEPTH)
+    PATHS=($($BUSYBOX find $PATH -follow -maxdepth $MAXDEPTH))
     if [ ${#PATHS[@]} -gt 1 ]; then
-        $BUSYBOX grep -s '' $PATHS
+        $BUSYBOX grep -s '' ${PATHS[@]}
     fi
 }