osc/rdma: fix warnings introduced by r31204

cmr=v1.8:ticket=trac:4449

This commit was SVN r31221.

The following SVN revision numbers were found above:
  r31204 --> open-mpi/ompi@949abe45cd

The following Trac tickets were found above:
  Ticket 4449 --> https://svn.open-mpi.org/trac/ompi/ticket/4449

ompi/mca/osc/rdma/osc_rdma_data_move.c

@@ -823,7 +823,7 @@ static int ompi_osc_rdma_acc_long_start (ompi_osc_rdma_module_t *module, int sou
         ((unsigned long) acc_header->displacement * module->disp_unit);
     struct ompi_op_t *op = ompi_osc_base_op_create(acc_header->op);
     ompi_datatype_t *primitive_datatype;
-    int primitive_count;
+    uint32_t primitive_count;
     int ret;
 
     OPAL_OUTPUT_VERBOSE((50, ompi_osc_base_framework.framework_output,
@@ -952,7 +952,7 @@ static int ompi_osc_gacc_long_start (ompi_osc_rdma_module_t *module, int source,
     struct osc_rdma_accumulate_data_t *acc_data;
     ompi_datatype_t *primitive_datatype;
     ompi_request_t *recv_request;
-    int primitive_count;
+    uint32_t primitive_count;
     ompi_proc_t *proc;
     size_t buflen;
     void *buffer;