[Bug 246964] bhyve usb_mouse SIGSEGV on null pointer dereference

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246964

            Bug ID: 246964
           Summary: bhyve usb_mouse SIGSEGV on null pointer dereference
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bhyve
          Assignee: virtualization at FreeBSD.org
          Reporter: ali.abdallah at suse.com

Created attachment 215206
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=215206&action=edit
Fix null pointer dereference in usb_mouse

By chance when I was running 'supportconfig' on a openSUSE 15.1 guest under
bhyve, it crashes with SIGSEGV. Debugging and checking the code revealed the
problem. 

usb_mouse.c:538 eshort = data->blen > 0;

the data pointer above is accessed while being null. Attached is a trivial
patch that fixes the issue for me.

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