Fixed bug in last push found by valgrind

myisam/mi_dbug.c:
  Added comment to warn about probabably unimportant valgrind warning
sql/opt_range.cc:
  Fixed bug in last push (did not fill max string properly with end space)
sql/sql_update.cc:
  Initalize not initialized variable

myisam/mi_dbug.c

@@ -137,6 +137,10 @@ void _mi_print_key(FILE *stream, register MI_KEYSEG *keyseg,
     {
       uint tmp_length;
       get_key_length(tmp_length,key);
+      /*
+	The following command sometimes gives a warning from valgrind.
+	Not yet sure if the bug is in valgrind, glibc or mysqld
+      */
       VOID(fprintf(stream,"%.*s",(int) tmp_length,key));
       key+=tmp_length;
       break;

sql/opt_range.cc

@@ -1062,7 +1062,7 @@ get_mm_leaf(PARAM *param, Field *field, KEY_PART *key_part,
   if (field->key_type() == HA_KEYTYPE_VARTEXT)
     copies= 2;
   str= str2= (char*) alloc_root(param->mem_root,
-				(key_part->part_length+maybe_null)*copies);
+				(key_part->part_length+maybe_null)*copies+1);
   if (!str)
     DBUG_RETURN(0);
   if (maybe_null)
@@ -1078,16 +1078,15 @@ get_mm_leaf(PARAM *param, Field *field, KEY_PART *key_part,
     uint length= uint2korr(str+maybe_null);
     char *end;
     str2= str+ key_part->part_length + maybe_null;
-    /* remove end space.  The 2 is for the packed length */
-    while (length > 0 && str[length+2+maybe_null-1] == ' ')
+    /* remove end space */
+    while (length > 0 && str[length+HA_KEY_BLOB_LENGTH+maybe_null-1] == ' ')
       length--;
     int2store(str+maybe_null, length);
     /* Create key that is space filled */
-    memcpy(str2, str, length+2+maybe_null);
-    end= str2+ maybe_null + key_part->part_length;
-    for (char *pos= str2+ 2+ length + maybe_null; pos < end ; pos++)
-      *pos++= ' ';
-    int2store(str2+maybe_null, key_part->part_length);
+    memcpy(str2, str, length + HA_KEY_BLOB_LENGTH + maybe_null);
+    bfill(str2+ length+ HA_KEY_BLOB_LENGTH +maybe_null,
+	  key_part->part_length-length - HA_KEY_BLOB_LENGTH, ' ');
+    int2store(str2+maybe_null, key_part->part_length - HA_KEY_BLOB_LENGTH);
   }
   if (!(tree=new SEL_ARG(field,str,str2)))
     DBUG_RETURN(0);		// out of memory

sql/sql_update.cc

@@ -440,7 +440,7 @@ multi_update::multi_update(THD *thd_arg, TABLE_LIST *table_list,
   :all_tables(table_list), update_tables(0), thd(thd_arg), tmp_tables(0),
    updated(0), found(0), fields(field_list), values(value_list),
    table_count(0), copy_field(0), handle_duplicates(handle_duplicates_arg),
-   do_update(1), trans_safe(0)
+   do_update(1), trans_safe(0), transactional_tables(1)
 {}