Fixed code that parses the DELIMITER command to correctly calculate

the length of the remaining input string.

This is to fix mysqldump test failure in PB introduced by the patch
for bug #26215.

client/mysql.cc

@@ -1347,10 +1347,9 @@ static bool add_line(String &buffer,char *line,char *in_string,
       }
     }
     else if (!*ml_comment && !*in_string &&
-             (out - line) >= 9 &&
-             !my_strnncoll(charset_info, (uchar*) pos, 9,
-                           (const uchar*) "delimiter", 9) &&
-             my_isspace(charset_info, pos[9]))
+             strlen(pos) >= 10 &&
+             !my_strnncoll(charset_info, (uchar*) pos, 10,
+                           (const uchar*) "delimiter ", 10))
     {
       // Flush previously accepted characters
       if (out != line)