Don't implicitly cast NULL to a bool

The code is wrong and causes an error when building with clang 3.4
(-Werror,-Wnull-conversion)

Change-Id: If03aa782fa25337802ff906a0d06071fbda93e26
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
1 file changed