dracut-functions: bashified ret=ret+$? to ret+=$?

diff --git a/dracut-functions b/dracut-functions
index 2accaec1b3845b3c6be65703740ffa5604fab2d2..2fc24718f3b4c8d1938b78ed255dd16b6c184bf6 100755 (executable)
--- a/dracut-functions
+++ b/dracut-functions
@@ -787,7 +787,7 @@ instmods() {
                 # it may require
                 for_each_kmod_dep install_kmod_with_fw $mod \
                     --set-version $kernel ${moddirname}
-                ret=$((ret+$?))
+                ((ret+=$?))
                 ;;
         esac
         shift