[Bug 250671] error reporting with bhyvectl could be improved

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250671

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A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=6bb140e3ca895a148f32c93d50f93619bf735f73

commit 6bb140e3ca895a148f32c93d50f93619bf735f73
Author:     Robert Wing <rew at FreeBSD.org>
AuthorDate: 2021-03-07 06:19:30 +0000
Commit:     Robert Wing <rew at FreeBSD.org>
CommitDate: 2021-03-07 06:19:30 +0000

    bhyvectl: print a better error message when vm_open() fails

    Use errno to print a more descriptive error message when vm_open() fails

    libvmm: preserve errno when vm_device_open() fails

    vm_destroy() squashes errno by making a dive into sysctlbyname() - we
    can safely skip vm_destroy() here since it's not doing any critical
    clean up at this point. Replace vm_destroy() with a free() call.

    PR:             250671
    MFC after:      3 days
    Submitted by:   marko at apache.org
    Reviewed by:    grehan
    Differential Revision:  https://reviews.freebsd.org/D29109

 lib/libvmmapi/vmmapi.c       | 2 +-
 usr.sbin/bhyvectl/bhyvectl.c | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

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