update diff_cp

tools/manage_md5-lists/diff_cp

@@ -36,7 +36,8 @@ cat "$md5_tmp" | while read line; do
       mkdir -p "$file_aim_dir"
       if [ -f "${file_aim}" ]; then
         echo "${file_md5}  ${file_aim}" >> ${md5_conflict}
-        echo "ERROR: ${file_md5} already exist, skipping"
+        sed -i "/$file_md5/d" "$md5"
+        echo "ERROR: ${file_aim} already exist, skipping"
       else
 
         file_md5_new=$(cat "${file_orig}" | tee "${file_aim}" | md5sum | cut -c -32)