Fix a possible null pointer derefernce:
The pointer returned by pxDuplicateNetworkBufferWithDescriptor()
was being dereferenced outside its null checks.
This could only happen if ipconfigZERO_COPY_TX_DRIVER was enabled.
Conveniently, the statement that used the pointer could be moved
into the scope of the null check.
Co-authored-by: Andreas Nordal <andreas.nordal@zivid.com>
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