This fixes the following kbuild test robot warning:

>> drivers/i2c/busses/i2c-dln2.c:70:1-4: WARNING: end returns can be simplified if negative or 0 value
Reported-by: Nkbuild test robot <fengguang.wu@intel.com>
Reported-by: NJulia Lawall <julia.lawall@lip6.fr>
Signed-off-by: NOctavian Purdila <octavian.purdila@intel.com>
Acked-by: NWolfram Sang <wsa@the-dreams.de>
Signed-off-by: NLee Jones <lee.jones@linaro.org>