fix environment variable for cofs dir

This commit was SVN r1640.

src/tools/mpirun/mpirun

@@ -157,8 +157,8 @@ do_start_proc() {
     cmd="${cmd} -cellid 1 -jobid ${ompi_jobid} -procid ${rmt_vpid}"
     cmd="${cmd} -numprocs ${ompi_numprocs}"
     cmd="${cmd} -pwd ${ompi_cwd} ${ompi_prepped}"
-    if test ! -z "${MCA_common_ompi_cofs_comm_dir}" ; then
-        cmd="${cmd} -commdir ${MCA_common_ompi_cofs_comm_dir}"
+    if test ! -z "${OMPI_MCA_oob_cofs_dir}" ; then
+        cmd="${cmd} -commdir ${OMPI_MCA_oob_cofs_dir}"
     fi
     cmd="${cmd} -- ${argv}"
     ${cmd}