Now that pmap_enter is allowed to fail in some cases, allow pmap_enk* and pmap_enu* to fail and return failure to pmap_enter. pmap_enter will panic when PMAP_CANFAIL is not set, but the alternative is worse. Besides, it shouldn't happen.
Now that pmap_enter is allowed to fail in some cases, allow
pmap_enk* and pmap_enu* to fail and return failure to pmap_enter.
pmap_enter will panic when PMAP_CANFAIL is not set, but the alternative
is worse. Besides, it shouldn't happen.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars