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Mark auto as invalid storage class for parameters

The only valid storage class for a parameter is register.

--- a/cc1/decl.c

+++ b/cc1/decl.c

@@ -69,10 +69,10 @@

 		error("incorrect function type for a function parameter");

 	if (tp->op == ARY)

 		tp = mktype(tp->type, PTR, 0, NULL);

+	if (sym->flags & (ISSTATIC|ISEXTERN|ISAUTO))

+		error("bad storage class in function parameter");

 	if (!sclass)

 		sym->flags |= ISAUTO;

-	if (sym->flags & (ISSTATIC|ISEXTERN))

-		error("bad storage class in function parameter");

 	if (n++ == NR_FUNPARAM)

 		error("too much parameters in function definition");

 	funtp->pars = xrealloc(funtp->pars, n * sizeof(Type *));