mctp: Fix check for dev_hard_header() result
dev_hard_header() returns the length of the header, so we need to test for negative errors rather than non-zero. Fixes: 889b7da2 ("mctp: Add initial routing framework") Signed-off-by: Matt Johnston <matt@codeconstruct.com.au> Signed-off-by: David S. Miller <davem@davemloft.net>
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