Bug #69682 - mysqld crashes after uninstall of plugin with "first" status var

mysql-test/r/fulltext_plugin.result

@@ -3,3 +3,5 @@ CREATE TABLE t1(a TEXT, b TEXT, FULLTEXT(a) WITH PARSER simple_parser);
 ALTER TABLE t1 ADD FULLTEXT(b) WITH PARSER simple_parser;
 DROP TABLE t1;
 UNINSTALL PLUGIN simple_parser;
+show status like 'a%status';
+Variable_name	Value

mysql-test/t/fulltext_plugin.test

@@ -9,3 +9,9 @@ CREATE TABLE t1(a TEXT, b TEXT, FULLTEXT(a) WITH PARSER simple_parser);
 ALTER TABLE t1 ADD FULLTEXT(b) WITH PARSER simple_parser;
 DROP TABLE t1;
 UNINSTALL PLUGIN simple_parser;
+
+#
+# Bug #69682 - mysqld crashes after uninstall of plugin with "first" status var
+#
+show status like 'a%status';
+

plugin/fulltext/plugin_example.c

@@ -210,7 +210,7 @@ static struct st_mysql_ftparser simple_parser_descriptor=
 
 static struct st_mysql_show_var simple_status[]=
 {
-  {"static",     (char *)"just a static text",     SHOW_CHAR},
+  {"A_static",   (char *)"just a static text",     SHOW_CHAR},
   {"called",     (char *)&number_of_calls, SHOW_LONG},
   {0,0,0}
 };

sql/sql_show.cc

@@ -2199,12 +2199,11 @@ void remove_status_vars(SHOW_VAR *list)
   {
     pthread_mutex_lock(&LOCK_status);
     SHOW_VAR *all= dynamic_element(&all_status_vars, 0, SHOW_VAR *);
-    int a= 0, b= all_status_vars.elements, c= (a+b)/2;
 
     for (; list->name; list++)
     {
-      int res= 0;
-      for (a= 0, b= all_status_vars.elements; b-a > 1; c= (a+b)/2)
+      int res= 0, a= 0, b= all_status_vars.elements, c= (a+b)/2;
+      for (; b-a > 0; c= (a+b)/2)
       {
         res= show_var_cmp(list, all+c);
         if (res < 0)