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The function sp8870_readreg returns a negative value when i2c_transfer fails so properly check for this and return the error if it happens. Cc: Sean Young <sean@mess.org> Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Signed-off-by: Alaa Emad <alaaemadhossney.ae@gmail.com> Link: https://lore.kernel.org/r/20210503115736.2104747-60-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>