s390: remove WARN_ON for misc_deregister() failures
The previous change added WARN_ON() in misc_deregister(). So it is not necessary to WARN_ON() misc_deregister() failure by callers. Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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