init-early: use posix printf instead of echo -n

lib/tiny-cloud/init-early

@@ -31,11 +31,11 @@ install_hotplugs() {
 
     for module in $HOTPLUG_MODULES; do
         result='-'
-        echo -n " $module"
+        printf " $module"
         if type "mod__$module" | grep -q "is a function"; then
             "mod__$module" && result='+' || { result='!'; rc=1; }
         fi
-        echo -n "($result)"
+        printf "($result)"
     done
     return $rc
 }