From a96e4e2ffe439e45732d820fac6fee486b6412bf Mon Sep 17 00:00:00 2001
From: Roland Dreier <roland@purestorage.com>
Date: Thu, 19 Dec 2013 08:37:03 -0800
Subject: [PATCH] IB/uverbs: New macro to set pointers to NULL if length is 0
 in INIT_UDATA()

Trying to have a ternary operator to choose between NULL (or 0) and the
real pointer value in invocations leads to an impossible choice between
a sparse error about a literal 0 used as a NULL pointer, and a gcc
warning about "pointer/integer type mismatch in conditional expression."

Rather than clutter the source with more casts, move the ternary
operator into a new INIT_UDATA_BUF_OR_NULL() macro, which makes it
easier to use and simplifies its callers.

Reported-by: Yann Droneaud <ydroneaud@opteya.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
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