Correct a pointer target type (no functional change) and simplify some code.
Correct a pointer target type (no functional change) and simplify some code.

* subversion/libsvn_subr/mergeinfo.c
  (svn_mergeinfo__set_inheritance): Simplify a hash dereference.
  (svn_mergeinfo__remove_prefix_from_catalog): Correct a pointer target type.

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