config: add echo comment to easily identify sed_csum errors.

helpers/config

@@ -267,5 +267,6 @@ remove_patch(){
 }
 
 sed_csum() {
+    echo "> Checksum replace for $1 in progress..."
     grep -rl "$1" "${3:-"./"}" | xargs -r /bin/sed -i "s|$1|$2|"
 }