[Bug target/14557] va_list is automatically taken address-of when passed as argument

[Zack Weinberg]

&ap should always work; taking the address of an array produces a
pointer to the array, which has a different type but the same value as
the pointer to the first element that you get if you don't take the
address.  You have to write *ap in the callee, is all.

As far as I can see the original example is strictly conforming and
the warning should not be issued.

zw