Change sqlite3_busy_timeout so that it checks for an invalid database

pointer. (CVS 3320)

FossilOrigin-Name: 225a9597b21bde7666451fc2eb7695dc35c438bb

src/main.c

@@ -14,7 +14,7 @@
 ** other files are for internal use by SQLite and should not be
 ** accessed by users of the library.
 **
-** $Id: main.c,v 1.350 2006/06/27 20:06:45 drh Exp $
+** $Id: main.c,v 1.351 2006/07/06 10:59:58 drh Exp $
 */
 #include "sqliteInt.h"
 #include "os.h"
@@ -366,6 +366,9 @@ void sqlite3_progress_handler(
 ** specified number of milliseconds before returning 0.
 */
 int sqlite3_busy_timeout(sqlite3 *db, int ms){
+  if( sqlite3SafetyCheck(db) ){
+    return SQLITE_MISUSE;
+  }
   if( ms>0 ){
     db->busyTimeout = ms;
     sqlite3_busy_handler(db, sqliteDefaultBusyCallback, (void*)db);