9529 libefi: efi_alloc_and_read should check for PMBR

Trying to read MBR only usb stick:
installboot -i /dev/rdsk/c7t0d0p1
open: No such file or directory

open: No such file or directory

read: Bad file number

Error reading bootblock from /dev/rds1
using fixed libefi:
env LD_LIBRARY_PATH=./lib/libefi/i386 installboot -i /dev/rdsk/c7t0d0p1
Extended version string: 1.1-2017.0.0.1

MD5 hash: e794b290bc596560f6980cccc78b0b4a
env LD_LIBRARY_PATH=./lib/libefi/i386 installboot -i /dev/rdsk/c3t0d0s1
Extended version string: 1.1-2017.0.0.2

MD5 hash: dfd0678f1e81dcc72cd4557881b520e8
Also tested newfs:
root@test:/home/tsoome# newfs /dev/zvol/rdsk/raid/test 
newfs: construct a new file system /dev/zvol/rdsk/raid/test: (y/n)? y
Warning: 4096 sector(s) in last cylinder unallocated
/dev/zvol/rdsk/raid/test:       2097152 sectors in 342 cylinders of 48 tracks, 128 sectors
        1024,0MB in 25 cyl groups (14 c/g, 42,00MB/g, 20160 i/g)
super-block backups (for fsck -F ufs -o b=#) at:
 32, 86176, 172320, 258464, 344608, 430752, 516896, 603040, 689184, 775328,
 1292192, 1378336, 1464480, 1550624, 1636768, 1722912, 1809056, 1895200,
 1981344, 2067488
root@test:/home/tsoome# fstyp /dev/zvol/rdsk/raid/test 
ufs
root@test:/home/tsoome#

root@test:/usr/lib# newfs /dev/zvol/rdsk/raid/swap
newfs: construct a new file system /dev/zvol/rdsk/raid/swap: (y/n)? y
/dev/zvol/dsk/raid/swap is currently used by swap. Please see swap(1M).
root@test:/usr/lib# newfs /dev/zvol/rdsk/raid/dump
newfs: construct a new file system /dev/zvol/rdsk/raid/dump: (y/n)? y
/dev/zvol/dsk/raid/dump is in use by dump. Please see dumpadm(1M).
root@test:/usr/lib#