Code refactor: Handle no-ops earlier.
Code refactor: Handle no-ops earlier.

* subversion/libsvn_client/merge.c
  (do_merge, do_single_file_merge): Remove no-op check.
  (svn_client_merge3, svn_client_merge_peg3):
   Return for no-op merge earlier.

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