verify: use appropriate local variable in "checkentry()" Before this patch, "checkentry()" internal function uses both "node"(argument of itself) and "n"(defined in outer of it) variables. Because all callers of "checkentry()" use "n" to refer the object which is passed to "checkentry()" as "node", both can refer same object in "checkentry()". So, "checkentry()" works correctly. But such usage is not good for independence of "checkentry()". This patch replaces "n" in "checkentry()" with "node".