module: split taint work out of check_modinfo_livepatch()

The work to taint the kernel due to a module should be split
up eventually. To aid with this, split up the tainting on
check_modinfo_livepatch().

This let's us bring more early checks together which do return
a value, and makes changes easier to read later where we stuff
all the work to do the taints in one single routine.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>