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A looney tunes server sending an invalid error code (which is !IS_ERR_VALUE) can result in a client oops. So fix it by adding a check and converting unknown or invalid error codes to -ESERVERFAULT. Signed-off-by: Abhishek Kulkarni <adkulkar@umail.iu.edu> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>