[Bug 232210] sendfile(2) doesn't percolate up issues with copyout(9) related to sbytes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232210

            Bug ID: 232210
           Summary: sendfile(2) doesn't percolate up issues with
                    copyout(9) related to sbytes
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: yaneurabeya at gmail.com

Created attachment 198079
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=198079&action=edit
Percolate up errors from copyout(9) operation with `sbytes`

While doing some digging around the syscall, I noticed (via code inspection)
that it doesn't percolate issues with copyout back to userspace. This means
that failures to call copyout might result in incorrectly communicated values
for sbytes.

The attached patch percolates up the EFAULT issues from copyout.

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