remove a redundant MPI_File_set_view

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1942 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
revise ncmpii_check_mpifh()

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1943 c368ceb8-fd28-0410-a457-e46ee1d7cd4a