Follow-up to r26803 and r26813.
Follow-up to r26803 and r26813.

* subversion/libsvn_client/merge.c
  (drive_merge_report_editor): Document the requirement on 
   'CHILDREN_WITH_MERGEINFO'.
   Remove check for non-empty CHILDREN_WITH_MERGEINFO.
  (svn_client_merge3, svn_client_merge_peg3): Localize the visiblity of 
   'children_with_mergeinfo' to where it is used. 
   Move calls to 'cleanup_noop_merge' and 'svn_client__elide_children' to 
   if('same_urls') block as it matters to it alone. 
   Explicitly pass 'children_with_mergeinfo' as 'NULL'
   for !same_urls block.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion