Refuse to restore if the character is dead.

This prevents recovering from death by killing the game between death
and exit, producing an automatic save.

rogue3/save.c

@@ -234,6 +234,12 @@ restore(char *file, char **envp)
 	return FALSE;
     }
 
+    if (pstats.s_hpt <= 0) {
+        endwin();
+        printf("This character is already dead.\n");
+        return FALSE;
+    }
+
     environ = envp;
     strcpy(file_name, file);
     setup();