27908 ::gcore breaks sparc build

@@ -185,15 +185,16 @@
 read_gwin(struct ps_prochandle *P, struct rwindow *rwp, uintptr_t sp)
 {
         gwin_query_t gq;
 
         if (P->state == PS_DEAD) {
-                lwp_info_t *lwp = list_next(&P->core->core_lwp_head);
+                core_info_t *core = P->data;
+                lwp_info_t *lwp = list_next(&core->core_lwp_head);
                 uint_t n;
                 int i;
 
-                for (n = 0; n < P->core->core_nlwp; n++, lwp = list_next(lwp)) {
+                for (n = 0; n < core->core_nlwp; n++, lwp = list_next(lwp)) {
                         gwindows_t *gwin = lwp->lwp_gwins;
 
                         if (gwin == NULL)
                                 continue; /* No gwindows for this lwp */