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Allow only integer expressions in switch

convert() can do some conversions that are not allowed in a switch,
like for example from a float to integer.

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -219,8 +219,9 @@

 	expect(SWITCH);

 	expect ('(');

 	cond = expr();

-	if ((cond = convert(cond, inttype, 0)) == NULL)

+	if (cond->type->op != INT)

 		error("incorrect type in switch statement");

+	cond = convert(cond, inttype, 0);

 	expect (')');

 	lbreak = newsym(NS_LABEL);