Don't instantiate+init variables in a switch block.

Avoid compiler warning about (unnecessarily) initializing 2 variables
during instantiation at the top of a switch block (but outside of any
case statements): just declare the variables at the top of the outter
block.  They're already safely initialized, so don't worry about
initializing them in the instantiation.

Reviewed by Dave Goodell.

cmr=v1.7.4:reviewer=ompi-rm1.7:subject=Don't instantiate+init variables in a switch block

This commit was SVN r30228.

ompi/mca/btl/usnic/btl_usnic_component.c

@@ -1454,12 +1454,12 @@ static void dump_endpoint(ompi_btl_usnic_endpoint_t *endpoint)
 
     OPAL_LIST_FOREACH(frag, &endpoint->endpoint_frag_send_queue,
                       ompi_btl_usnic_frag_t) {
+        ompi_btl_usnic_small_send_frag_t *ssfrag;
+        ompi_btl_usnic_large_send_frag_t *lsfrag;
+
         snprintf(str, sizeof(str), "      --> frag %p, %s", (void *)frag,
                  usnic_frag_type(frag->uf_type));
         switch (frag->uf_type) {
-            ompi_btl_usnic_small_send_frag_t *ssfrag = NULL;
-            ompi_btl_usnic_large_send_frag_t *lsfrag = NULL;
-
             case OMPI_BTL_USNIC_FRAG_LARGE_SEND:
                 lsfrag = (ompi_btl_usnic_large_send_frag_t *)frag;
                 snprintf(tmp, sizeof(tmp), " tag=%"PRIu8" id=%"PRIu32" offset=%llu/%llu post_cnt=%"PRIu32" ack_bytes_left=%llu\n",