drivers/dht: fix null deref with saul #20927
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Contribution description
The SAUL interface exposes two sensors for humidity and temperature, while the internal
dhtdriver exposes a singledht_readfunction with two pointers to store humidity and temperature results. The SAUL wrappers pass NULL for the value they're not interested in, butdht_readdoes not check for that and tries to store both values all the time, causing a segfault.Testing procedure
The initial bug and its fix have been observed with a DHT11 on a Wemos D1 Mini with the
saulshell command.Issues/PRs references
N/A