efi_loader: call __efi_exit_check in efi_exit

The calls to __efi_entry_check and __efi_exit_check have to match.
If DEBUG is defined, panic() will be called otherwise.

If debugging is activated some Travis CI builds fail due to an
assertion in EFI_CALL without the patch.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

lib/efi_loader/efi_boottime.c

@@ -793,6 +793,8 @@ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
 	EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
 		  exit_data_size, exit_data);
 
+	__efi_exit_check();
+
 	loaded_image_info->exit_status = exit_status;
 	longjmp(&loaded_image_info->exit_jmp, 1);