!63 fclose函数无法释放线程锁问题修复

Merge pull request !63 from wangchen/mutex_free

porting/liteos_m/kernel/src/stdio/fclose.c

@@ -29,6 +29,8 @@ int __fclose(FILE *f)
 	if (*head == f) *head = f->next;
 	__ofl_unlock();
 
+	pthread_mutex_destroy(f->lock);
+
 	free(f->getln_buf);
 	free(f);