stand/efihttp: Add device type check to efihttp_fs_open()

Ensure the open operation targets an HTTP device. Return EINVAL if
not, to prevent potential system crashes when used on other devices.

Dif

stand/efihttp: Add device type check to efihttp_fs_open()

Ensure the open operation targets an HTTP device. Return EINVAL if
not, to prevent potential system crashes when used on other devices.

Differential Revision: https://reviews.freebsd.org/D48439
Reviewed by: dab, imp, vangyzen
Sponsored by: Dell Technologies

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