[Bug 217630] sbin/devd: reports kldload errors for non-existent modules trying to be loaded

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217630

            Bug ID: 217630
           Summary: sbin/devd: reports kldload errors for non-existent
                    modules trying to be loaded
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ngie at FreeBSD.org

Repro:

- Build kernel without ums support (either statically or as a module).
- Plug in USB mouse.

Expected result:

- The kernel module load should be attempted, but should fail.
- The error message doesn't seem sensible to expose to the end user; I
recommend it be quieted for improved user experience and to reduce log spam.

Real life scenario:
- Virtual USB keyboards and mice are generally emulated by BMC firmware. If the
developer decides to build the kernel without ukbd/ums, it will always warn
(via devd) that it failed to load the modules, because they do not exist.

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