Commit
0c1597d50a9248a8243c34d530355c7fd7289839
by Andreas EversbergCorrectly calculate size iofd_msgb_alloc2()
When limiting headroom value to 16 bits, the allocated buffer will be
too small, if headroom exceeds 65535.
Related: Coverity CID#548925
Change-Id: I16c1e08fb64a1fafaeee1844fd8c00ecc2861d12
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