Bug #13819630 ARCHIVE TABLE WITH 1000+ PARTITIONS CRASHES SERVER

ON "DROP TABLE"

In the function ha_archive::write_row(), there is an error code path
that exits the function without releasing the mutex that was acquired
earlier.  

rb#1743 approved by ramil.

storage/archive/ha_archive.cc

@@ -898,10 +898,11 @@ int ha_archive::write_row(uchar *buf)
     table->timestamp_field->set_time();
   mysql_mutex_lock(&share->mutex);
 
-  if (!share->archive_write_open)
-    if (init_archive_writer())
-      DBUG_RETURN(HA_ERR_CRASHED_ON_USAGE);
-
+  if (!share->archive_write_open && init_archive_writer())
+  {
+    rc= HA_ERR_CRASHED_ON_USAGE;
+    goto error;
+  }
 
   if (table->next_number_field && record == table->record[0])
   {
@@ -980,8 +981,8 @@ int ha_archive::write_row(uchar *buf)
   rc= real_write_row(buf,  &(share->archive_write));
 error:
   mysql_mutex_unlock(&share->mutex);
-  my_free(read_buf);
-
+  if (read_buf)
+    my_free(read_buf);
   DBUG_RETURN(rc);
 }