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.

arogue5/save.c

@@ -245,6 +245,12 @@ char **envp;
 	}
     }
 
+    if (pstats.s_hpt <= 0) {
+        endwin();
+        printf("This character is already dead.\n");
+        return FALSE;
+    }
+
     environ = envp;
     strcpy(file_name, file);
     setup();