remove a pedantic warning

This commit was SVN r17196.

ompi/mca/pml/v/pml_v.c

@@ -11,4 +11,4 @@
 #include "ompi_config.h"
 #include "pml_v.h"
 
-mca_pml_v_t mca_pml_v = {NULL, 0, 0};
+mca_pml_v_t mca_pml_v = {0, 0};

ompi/mca/pml/v/pml_v.h

@@ -18,11 +18,11 @@
 BEGIN_C_DECLS
 
 struct mca_pml_v_t {
-    ompi_request_fns_t                  host_request_fns;
     size_t                              host_pml_req_recv_size;
     size_t                              host_pml_req_send_size;
     mca_pml_base_component_t            host_pml_component;
     mca_pml_base_module_t               host_pml;
+    ompi_request_fns_t                  host_request_fns;
 };
 typedef struct mca_pml_v_t mca_pml_v_t;