[PATCH] as: fix bpf expression parsing regression

[Nick Clifton]

Hi Will,

> As a result of a switch instead of an if, as would issue non-specific
> error messages when it encountered an operand it could not parse in bpf.
> This patch fixes that regression and adds a test to prevent it from
> reoccurring.
> 
> Tested for bpf-unknown-none on x86_64-redhat-linux.

Approved - please apply.

> -  switch (exp->X_op == O_absent || exp_parse_failed)
> +  if (exp->X_op == O_absent || exp_parse_failed)
>       return NULL;

I have to say that I am surprised that the original version of this
code compiled at all.  Or at least compiled without generating any
kind of warning message.

Cheers
   Nick