try to make sure we always have slots

C/absmi.c

@@ -856,7 +856,10 @@ Yap_absmi(int inp)
 
       BOp(Ystop, l);
       SET_ASP(YREG, E_CB*sizeof(CELL));
+      /* make sure ASP is initialised */
+      Yap_StartSlots();
       saveregs();
+      
 #if PUSH_REGS
       restore_absmi_regs(old_regs);
 #endif

C/c_interface.c

@@ -2566,8 +2566,8 @@ YAP_RestartGoal(void)
     LOCAL_PrologMode = UserCCallMode;
     if (out == FALSE) {
       /* cleanup */
-      Yap_CloseSlots( PASS_REGS1 );
       Yap_trust_last();
+      Yap_CloseSlots( PASS_REGS1 );
       LOCAL_AllowRestart = FALSE;
     }
   } else {