cleanup: don't update_virtual_fields from READ_RECORD

it was done only in some access methods, not in all,
so the caller had to update_virtual_fields anyway.

mysql-test/suite/vcol/r/vcol_supported_sql_funcs.result

@@ -2619,7 +2619,6 @@ a	b
 -1	18446744073709551615
 Warnings:
 Note	1105	Cast to unsigned converted negative integer to it's positive complement
-Note	1105	Cast to unsigned converted negative integer to it's positive complement
 drop table t1;
 set sql_warnings = 0;
 # Convert()
@@ -2641,7 +2640,6 @@ a	b
 -1	18446744073709551615
 Warnings:
 Note	1105	Cast to unsigned converted negative integer to it's positive complement
-Note	1105	Cast to unsigned converted negative integer to it's positive complement
 drop table t1;
 set sql_warnings = 0;
 #

sql/records.cc

@@ -358,8 +358,6 @@ static int rr_quick(READ_RECORD *info)
       break;
     }
   }
-  if (info->table->vfield)
-    update_virtual_fields(info->thd, info->table);
   return tmp;
 }
 
@@ -483,8 +481,6 @@ int rr_sequential(READ_RECORD *info)
       break;
     }
   }
-  if (!tmp && info->table->vfield)
-    update_virtual_fields(info->thd, info->table);
   return tmp;
 }