qcom: pil: Modify arguments to a min() macro check

sizeof() may not return the same type on all architectures.
Use the fixed buffer length of the failure reason buffer
as the argument to the min macro instead of using sizeof.

Change-Id: Iab912d0b24ea8afec8a993bc7c1fa27a811e9c38
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>