Fixed bugs found by valgrind

Other things:
- Removed innodb_encryption_tables.test from valgrind as it
  takes a REALLY long time

mysql-test/suite/encryption/t/innodb_encryption_tables.test

 -- source include/have_innodb.inc
 -- source include/have_example_key_management_plugin.inc
 -- source include/not_embedded.inc
+# We can't run this test under valgrind as it 'takes forever'
+-- source include/not_valgrind.inc
 
 create table innodb_normal(c1 bigint not null, b char(200)) engine=innodb;
 create table innodb_compact(c1 bigint not null, b char(200)) engine=innodb row_format=compact;

sql/field.cc

@@ -1438,7 +1438,7 @@ void Field::error_generated_column_function_is_not_allowed(THD *thd,
                                 QT_ITEM_IDENT_SKIP_TABLE_NAMES));
   my_error(ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED,
            MYF(error ? 0 : ME_JUST_WARNING),
-           tmp.c_ptr(), vcol_info->get_vcol_type_name(),
+           tmp.c_ptr_safe(), vcol_info->get_vcol_type_name(),
            const_cast<const char*>(field_name));
 }
 

sql/log_event.cc

@@ -10228,6 +10228,8 @@ const char *sql_ex_info::init(const char *buf, const char *buf_end,
   }
   else
   {
+    if (buf_end - buf < 7)
+      return 0;                                 // Wrong data
     field_term_len= enclosed_len= line_term_len= line_start_len= escaped_len=1;
     field_term = buf++;			// Use first byte in string
     enclosed=	 buf++;