Fix some fairly-important typos (!)

This commit was SVN r24328.

test/datatype/ddt_lib.c

@@ -209,7 +209,7 @@ int mpich_typeub2( void )
 
 int mpich_typeub3( void )
 {
-   int blocklen[2], err = 0, idisp[3];
+   int blocklen[3], err = 0, idisp[3];
    size_t sz;
    MPI_Aint disp[3], lb, ub, ex;
    ompi_datatype_t *types[3], *dt1, *dt2, *dt3, *dt4, *dt5;

test/datatype/ddt_raw.c

@@ -45,7 +45,7 @@ static int test_upper( unsigned int length )
 {
     ompi_datatype_t *pdt;
     opal_convertor_t * pConv;
-    int rc;
+    int rc = OMPI_SUCCESS;
     unsigned int i, iov_count, split_chunk, total_length;
     size_t max_data;
     struct iovec iov[5];

test/datatype/opal_ddt_lib.c

@@ -761,7 +761,7 @@ int mpich_typeub2( void )
 
 int mpich_typeub3( void )
 {
-   int blocklen[2], err = 0, idisp[3];
+   int blocklen[3], err = 0, idisp[3];
    size_t sz;
    OPAL_PTRDIFF_TYPE disp[3], lb, ub, ex;
    opal_datatype_t *types[3], *dt1, *dt2, *dt3, *dt4, *dt5;