ANDROID: firmware_loader: Emit empty string when no custom paths
firmware_param_path_get will return -1 if no custom firmware paths have been set. Use sysfs_emit_at to form the response string and now emit an empty string as expected when there are no custom firmware paths. Fixes: ce17e299 ("ANDROID: firmware_loader: Add support for customer firmware paths") Change-Id: If695733c81b3cef105c28dff7a6c1b6e722b2169 Signed-off-by:Elliot Berman <quic_eberman@quicinc.com>
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