cmake: avoid -Wnonnull
warning in HAVE_FSETXATTR_5
detection
#16427
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Seen in Android 21/35 CI jobs:
Ref: https://github.com/curl/curl/actions/runs/13460225795/job/37613494183#step:9:5978
Follow-up to bd9f9b0 #16377
This leaves 10 remaining
-Wnonnull
warnings per Android AM jobs.