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FROMGIT: power: supply: qcom_battmgr: fix battery chemistry strncmp
The battery_chemistry field is a 4-byte array without guaranteed null termination. Using BATTMGR_CHEMISTRY_LEN (4) as the strncmp length for 3-character string literals implicitly requires chemistry[3] == '\0', which may not hold. Use 3 instead to match only the significant bytes.
Link: https://lore.kernel.org/all/20260812-fix-qcom-batt-chemistry-strn-v1-1-458545e02641@oss.qualcomm.com/
CRs-Fixed: 4562260