Remove dead code and cleanup scoping in dmu_send.c

This addresses a number of problems with dmu_send.c:

* bp_span is unused which makes clang complain
* dump_write conflicts with FreeBSD's existing core dump code
* range_alloc is private to the file and not declared in any headers
  causing clang to complain

Reviewed-by: Matt Ahrens <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Matt Macy <[email protected]>
Closes #9432 

0 files changed, 0 insertions, 0 deletions