Re: kfifo must_check warning (+ patch)

[Alan Cox]

> Some versions of gcc mysteriously report:
> drivers/char/n_gsm.c:1580: warning: ignoring return value of '__kfifo_must_check_helper', declared with attribute warn_unused_result
> 
> This warning can be eliminated by using a local variable for the
> returned result value, as suggested by Andrew Morton.

But that just hides the bug in the helper surely - the helper has type
errors so needs fixing - not this. If you apply this then the underlying
bug is just going to get forgotten

Alan
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