LoadPin: Ignore the "contents" argument of the LSM hooks

LoadPin only enforces the read-only origin of kernel file reads. Whether
or not it was a partial read isn't important. Remove the overly
conservative checks so that things like partial firmware reads will
succeed (i.e. reading a firmware header).

Fixes: 2039bda1fa8d ("LSM: Add "contents" flag to kernel_read_file hook")
Cc: Paul Moore <[email protected]>
Cc: James Morris <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Acked-by: Serge Hallyn <[email protected]>
Tested-by: Ping-Ke Shih <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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