minor compiler complaint fix

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

Author: hppritcha

ompi/mpi/c/ompi_sendrecv.c

@@ -94,4 +94,5 @@ int ompi_sendrecv(const void * sendbuf, size_t sendcount, MPI_Datatype sendtype,
     if( OPAL_UNLIKELY(MPI_SUCCESS != rcs && MPI_SUCCESS == rc) ) {
         rc = rcs;
     }
+    return rc;
 }