efi_selftest: add missing line feed in efi_selftest_miniapp_exit

If an error occurs we may see an output like:

    EFI application calling Exit

    Could not open loaded image protocolLoaded image protocol missing

Add the missing line feed.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
1 file changed