fix for sparkle motion mini warning #3044
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I believe this change should resolve this actions failure resulting from a warning about comparing signed with unsigned types: https://github.com/adafruit/Adafruit_Learning_System_Guides/actions/runs/15316694255/job/43091814706#step:7:902
The issue boils down to
Adafruit_Neopixel.numPixels()
returning an unsigned value, butint i = 0
from the loop variable being signed.I tested the modified version successfully on the sparkle motion mini with two 1x8 NeoPixel strips.