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cc2: Improve prnode()

Checking for invalid pointer makes more robust the code
because the root of the tree can be NULL too.

--- a/src/cmd/cc/cc2/node.c

+++ b/src/cmd/cc/cc2/node.c

@@ -33,10 +33,11 @@

 static void

 prnode(Node *np)

 {

-	if (np->left)

-		prnode(np->left);

-	if (np->right)

-		prnode(np->right);

+	if (!np)

+		return;

+	prnode(np->left);

+	prnode(np->right);

+

 	fprintf(stderr, "\t%c%lu", np->op, np->type.size);

 }