Remove unused struct.

This commit was SVN r15228.

ompi/mca/pml/ob1/pml_ob1.h

@@ -230,17 +230,6 @@ extern int mca_pml_ob1_ft_event(
     MCA_BML_BASE_BTL_DES_ALLOC(bml_btl, des, order,                     \
    sizeof(mca_pml_ob1_hdr_t) + (sizeof(mca_btl_base_segment_t) << 4), size)
 
-
-/**
- * structure to associate rdma btl with a registration
- */
-
-struct mca_pml_ob1_rdma_reg_t {
-    struct mca_bml_base_btl_t* bml_btl;
-    struct mca_mpool_base_registration_t* btl_reg;
-};
-typedef struct mca_pml_ob1_rdma_reg_t mca_pml_ob1_rdma_reg_t;
-
 #define MCA_PML_OB1_MAX_REGISTRATIONS 4
 
 struct mca_pml_ob1_pckt_pending_t {