Improve reporting from sf_report_leaked_memory()

Other things:
- Added DBUG_EXECUTE_IF("print_allocated_thread_memory") at end of query
  to easier find not freed memory allocated by THD
- Removed free_root() from plugin_init() that did nothing.

mysys/safemalloc.c

@@ -66,7 +66,7 @@ struct st_irem
   uint32 marker;               /* Underrun marker value           */
 };
 
-static int    sf_malloc_count= 0;              /* Number of allocated chunks */
+static uint   sf_malloc_count= 0;              /* Number of allocated chunks */
 
 static void  *sf_min_adress= (void*) (intptr)~0ULL,
              *sf_max_adress= 0;
@@ -344,7 +344,7 @@ int sf_sanity()
 {
   struct st_irem *irem;
   int flag= 0;
-  int count= 0;
+  uint count= 0;
 
   pthread_mutex_lock(&sf_mutex);
   count= sf_malloc_count;
@@ -369,6 +369,7 @@ void sf_report_leaked_memory(my_thread_id id)
 {
   size_t total= 0;
   struct st_irem *irem;
+  uint first= 0, chunks= 0;
 
   sf_sanity();
 
@@ -380,15 +381,18 @@ void sf_report_leaked_memory(my_thread_id id)
     {
       my_thread_id tid = irem->thread_id && irem->flags & MY_THREAD_SPECIFIC ?
                          irem->thread_id : 0;
+      if (!first++)
+        fprintf(stderr, "Memory report from safemalloc\n");
       fprintf(stderr, "Warning: %4lu bytes lost at %p, allocated by T@%llu at ",
               (ulong) irem->datasize, (char*) (irem + 1), tid);
       print_stack(irem->frame);
       total+= irem->datasize;
+      chunks++;
     }
   }
   if (total)
-    fprintf(stderr, "Memory lost: %lu bytes in %d chunks\n",
-            (ulong) total, sf_malloc_count);
+    fprintf(stderr, "Memory lost: %lu bytes in %u chunks of %u total chunks\n",
+            (ulong) total, chunks, sf_malloc_count);
   return;
 }
 

sql/sql_parse.cc

@@ -2480,6 +2480,8 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   */
   thd->lex->m_sql_cmd= NULL;
   free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
+  DBUG_EXECUTE_IF("print_allocated_thread_memory",
+                  SAFEMALLOC_REPORT_MEMORY(sf_malloc_dbug_id()););
 
 #if defined(ENABLED_PROFILING)
   thd->profiling.finish_current_query();

sql/sql_plugin.cc

@@ -1646,7 +1646,6 @@ int plugin_init(int *argc, char **argv, int flags)
         }
       }
 
-      free_root(&tmp_root, MYF(MY_MARK_BLOCKS_FREE));
       tmp.state= PLUGIN_IS_UNINITIALIZED;
       if (register_builtin(plugin, &tmp, &plugin_ptr))
         goto err_unlock;