Combine two if blocks with identical conditions.

* subversion/libsvn_client/merge.c
  (remove_noop_subtree_ranges): Move the call to svn_rangelist_merge2()
    into the preceeding if block which shares the same conditions.



git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1469614 13f79535-47bb-0310-9956-ffa450edef68