Fix a couple of memory leaks

src/DbStructureModel.cpp

@@ -124,10 +124,10 @@ void DbStructureModel::reloadData()
     beginResetModel();
 
     // Remove all data except for the root item
-    while(rootItem->childCount())
+    for(int i=rootItem->childCount();i;i--)
     {
-        delete rootItem->child(0);
-        rootItem->removeChild(rootItem->child(0));
+        delete rootItem->child(i-1);
+        rootItem->removeChild(rootItem->child(i-1));
     }
 
     // Return here if no DB is opened

src/sqlitedb.cpp

@@ -624,6 +624,7 @@ bool DBBrowserDB::executeSQL(QString statement, bool dirtyDB, bool logsql)
     } else {
         lastErrorMessage = QString("%1 (%2)").arg(QString::fromUtf8(errmsg)).arg(statement);
         qWarning() << "executeSQL: " << statement << "->" << errmsg;
+        sqlite3_free(errmsg);
         return false;
     }
 }

src/sqlitetypes.cpp

@@ -569,9 +569,12 @@ Table CreateTableWalker::table()
                     } while(tc != antlr::nullAST && tc->getType() != sqlite3TokenTypes::RPAREN);
 
                     if(fields.size() == 1 && constraint_name.isEmpty())
+                    {
                         fields[0]->setUnique(true);
-                    else
+                        delete unique;
+                    } else {
                         tab.addConstraint(fields, ConstraintPtr(unique));
+                    }
                 }
                 break;
                 case sqlite3TokenTypes::FOREIGN: