[PATCHv3] staging: Check for Null allocated skb in fw_download_code

On Tue, 12 Aug 2014 20:46:56 -0000, Jeff Haran said:

While the avoidance of dereferencing NULL pointers in the kernel is a
laudable goal, what will be the effect of the call to write_nic_byte() at the
end of the function not happening should the call to dev_alloc_skb() return
NULL?

Damn. I missed that one, good catch.
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