Remove dead code which would never execute.     i.e. checking to see if a cluster was every less than 48 bytes,     a rather unlikely case.
Remove dead code which would never execute.
    i.e. checking to see if a cluster was every less than 48 bytes,
    a rather unlikely case.

Check return value of m_dup_pkthdr() calls.

Found by: Coverity
Reviewed by: rwatson (mentor), Keiichi Shima (for Kame)
Approved by: rwatson (mentor)

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