VLA may cause a crash compiler

[zu2]

it crash compiler.

#include "common.h"

int sub(int x)
{
	unsigned char	i;
	unsigned char	sum = 0;
	unsigned char	p[x];

	for (i=0; i<10; i++){
		p[i] = i;
	}
	for (i=0; i<10; i++){
		sum += p[i];
	}
	return sum;
}

int main(int argc, char **argv)
{
	return sub(10)!=45;
}

When node is ND_VAR, node->ty can be NULL. A temporary fix prevents a crash, but a fundamental solution is needed.

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