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[cc1] Fix content()

With previous version of the code content() had no problems
receiving something different to a pointer, but, with the current
this is not true anymore. If we receive an array then it means
that we have a problem somewhere.

--- a/cc1/expr.c

+++ b/cc1/expr.c

@@ -494,10 +494,9 @@

 static Node *

 content(char op, Node *np)

 {

-	switch (BTYPE(np)) {

-	case ARY:

-	case FTN:

-	case PTR:

+	if (BTYPE(np) != PTR) {

+		errorp("invalid argument of memory indirection");

+	} else {

 		if (np->op == OADDR) {

 			Node *new = np->left;

 			new->type = np->type->type;

@@ -507,10 +506,8 @@

 			np = node(op, np->type->type, np, NULL);

 		}

 		np->flags |= NLVAL;

-		return np;

-	default:

-		error("invalid argument of memory indirection");

 	}

+	return np;

 }

 static Node *