[Bug 274600] /sbin/mount with invalid special device name gives confusing "Invalid fstype: Invalid argument" error

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274600

            Bug ID: 274600
           Summary: /sbin/mount with invalid special device name gives
                    confusing "Invalid fstype: Invalid argument" error
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: martin@lispworks.com

This error message is confusing because the fstype is not the problem:

root@fb15:~ # uname -a
FreeBSD fb15 15.0-CURRENT FreeBSD 15.0-CURRENT #0 main-n265728-8818f0f1124e:
Thu Oct  5 03:15:28 UTC 2023    
root@releng3.nyi.freebsd.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64
root@fb15:~ # mount /dev/foobar /mnt
mount: /dev/foobar: Invalid fstype: Invalid argument
root@fb15:~ # 

In FreeBSD 12.4, it gave the correct error:

mount: /dev/foobar: No such file or directory

It looks like commit 6e8272f317b899438165108a72fa04a4995611bd might be to blame
for this.

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