nbd: lower the loglevel of an error message
nbd: lower the loglevel of an error message

This is only an error, no need to use KERN_CRIT log level.

Signed-off-by: WANG Cong <b08afa93ec8eabe95bc97d12956ca699fa65834c@redhat.com>
Cc: Paul Clements <76d5feb7143d471cd747aca15dce1a0d6d9699ed@steeleye.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Jens Axboe <08e836a620179c237f631ad0545a7ebdf54201f3@fusionio.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs