libefi: efi_alloc_and_read fail on zvol
The added ioctl's in ticket
9529 libefi: efi_alloc_and_read should check for PMBR
do not work on zvol devices.
But it is still desirable that this function is working on zvol devices also.
The implementation do_ioctl of joyent ticket
OS-7260 SmartOS should support booting with loader
also not help here.