Fix fd leak if application forks

If the application forks, close the fd inherited from the parent.

Change-Id: I48e4157d5f0d6f04d07ecb23b719a23934687cdb
Signed-off-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>

src/openclose.c

@@ -68,6 +68,7 @@ static void clear_after_fork(void)
 	clear_events_page();
 	fmm_clear_all_mem();
 	destroy_device_debugging_memory();
+	close(kfd_fd);
 	kfd_open_count = 0;
 }