[Bug 240545] patch to remove unneeded M_WAITOK return value checks

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240545

--- Comment #15 from Andrew Reiter <arr at watson.org> ---
Created attachment 208169
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=208169&action=edit
updated patch with better coverage

Ok, so the cocci 2 script seems to generate some FP cases that I had to change
and this is expressed in this attachment. There may be some other cases not
found ... seems braces would play a factor (i.e., match on 'if () statement'-
like cases. I scanned the patch and seemed to see the cases that were being
handled. The cases that seemed questionable, I looked and adjusted as needed.
Tested with LINT and GENERIC... not much testing though.

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