IB/qib: Fix module-level leak
The vzalloc()'ed field physshadow is leaked on module unload. This patch adds vfree after the sibling page shadow is freed. Reported-by: NDean Luick <dean.luick@intel.com> Reviewed-by: NDean Luick <dean.luick@intel.com> Signed-off-by: NMike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: NRoland Dreier <roland@purestorage.com>
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