fix linux hwmon high/crit of -273150 mC (0 K) (#2959) - #2960
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I've backported my patch to 7.2.2 to test it out on system level, patching the Screenshot showing it working within s-tui, top uses psutil 7.2.2 unpatched, bottom uses psutil 7.2.2 + my changes backported: 
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Summary
sensors_temperatures()treats placeholder thresholds as real alarm limits #2959Description
sensors_temperatures()returns -273.15 as the literal sensor value when a hwmon trip point has not been configured in the kernel. This is the sentinel value the core hwmon driver writes when a max/crit threshold is unset (-273150 mC = 0 K = absolute zero), not a real measured temperature.The fix detects raw values of -273150 mC in both the hwmon and thermal zone paths and replaces them with None, matching the behavior for other unavailable thresholds. Apps like s-tui currently show -273.15 in red as an alarm limit, even though no alarm is present.