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2256cfac68
Use substr() instead of array index syntax to access the first
character of the endpoint host string, as ucode does not support
array-style indexing on strings.
Fixes: https://github.com/openwrt/openwrt/issues/22116
Fixes: 8f977b4a40 ("wireguard-tools: fix handling of multi-value config options")
Signed-off-by: Felix Fietkau <nbd@nbd.name>