Fix typo (sorry folks, this'll cause a lot of recompiling... :-\ )

This commit was SVN r2526.

src/mpi/c/bindings.h

@@ -36,7 +36,7 @@ do { \
    if( NULL == (DDT) || MPI_DATATYPE_NULL == (DDT) ) (RC) = MPI_ERR_TYPE; \
    else if( (COUNT) < 0 ) (RC) = MPI_ERR_COUNT; \
    else if( !ompi_ddt_is_committed((DDT)) ) (RC) = MPI_ERR_TYPE; \
-   else if( ompi_ddt_is_overerlapped((DDT)) ) (RC) = MPI_ERR_TYPE; \
+   else if( ompi_ddt_is_overlapped((DDT)) ) (RC) = MPI_ERR_TYPE; \
 } while (0)
 
 #define OMPI_CHECK_DATATYPE_FOR_ONE_SIDED( RC, DDT, COUNT ) \