[PATCH 0/2] target: remove dead kmap checks

[shao.mingyin]

kmap() and kmap_local_page() never return NULL, so the checks after them are
dead code.  Remove them.

No functional change intended; both patches are independent and can be
applied on their own or as a subset.

Signed-off-by: Shao Mingyin <shao.mingyin@xxxxxxxxxx>
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base-commit: 7649ba73f9e7e1e04d0b46213e39c79ae09dd55c