WL#1622 "SQL Syntax for Prepared Statements" - cosmetic code review fixes

mysql-test/r/ps.result:
  Added check if multiple SQL statements inside a PS are disabled
mysql-test/t/ps.test:
  Added check if multiple SQL statements inside a PS are disabled

mysql-test/r/ps.result

@@ -83,4 +83,10 @@ NULL
 NULL
 NULL
 NULL
+prepare stmt6 from 'select 1; select2';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near '; select2' at line 1
+prepare stmt6 from 'insert into t1 values (5,"five"); select2';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near '; select2' at line 1
+explain prepare stmt6 from 'insert into t1 values (5,"five"); select2';
+ERROR 42000: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near 'from 'insert into t1 values (5,"five"); select2'' at line 1
 drop table t1;

mysql-test/t/ps.test

@@ -75,5 +75,16 @@ execute stmt5 using @nullvar;
 set @nullvar2=NULL;
 execute stmt5 using @nullvar2;
 
+# Check that multiple SQL statements are disabled inside PREPARE
+--error 1064
+prepare stmt6 from 'select 1; select2';
+
+--error 1064
+prepare stmt6 from 'insert into t1 values (5,"five"); select2';
+
+# This shouldn't parse
+--error 1064
+explain prepare stmt6 from 'insert into t1 values (5,"five"); select2';
+
 drop table t1;
 

sql/sql_class.cc

@@ -1282,7 +1282,7 @@ static void delete_statement_as_hash_key(void *key)
   delete (Statement *) key;
 }
 
-byte *get_stmt_name_hash_key(Statement *entry, uint *length,
+static byte *get_stmt_name_hash_key(Statement *entry, uint *length,
                                     my_bool not_used __attribute__((unused)))
 {
   *length=(uint) entry->name.length;

sql/sql_yacc.yy

@@ -830,7 +830,6 @@ prepare:
           lex->prepared_stmt_code= $4;
         };
 
-
 execute:
         EXECUTE_SYM ident
         {