fib_dxr: free() does nothing if arg is NULL, so remove a redundant check.
MFC after: 1 week
Approved by: re (cperciva)
(cherry picked from commit 64136682ba1681e56093f77b4cec8bdfa6375a72)
fib_dxr: free() does nothing if arg is NULL, so remove a redundant check. Tags None Referenced Files None Subscribers None
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