bq25890: Fix equality check in bq25890_log_ntc_faults

This function is supposed to react when the new state differs
from the old one so it can log the new state. The check however
returned early in case of inequality, which defeats the purpose
of the function.
2 jobs for ntc_fault in 74 minutes and 36 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build:aarch64 #377668
librem5

00:37:29

passed build:deb #377669
librem5:arm64

01:14:36