of: Fix null pointer related warnings in base.c file
Fixes the following sparse warnings: drivers/of/base.c:176:41: warning: Using plain integer as NULL pointer drivers/of/base.c:178:37: warning: Using plain integer as NULL pointer drivers/of/base.c:500:49: warning: Using plain integer as NULL pointer Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org> Signed-off-by: NRob Herring <rob.herring@calxeda.com>
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