zram: only make zram_wb_devops for CONFIG_ZRAM_WRITEBACK
If writeback isn't configured, then we get the following warning when compiling zram: drivers/block/zram/zram_drv.c:1824:45: warning: unused variable 'zram_wb_devops' [-Wunused-const-variable] Make sure we only define the block_device_operations if that option is enabled. Link: https://lore.kernel.org/lkml/202111261614.gCJMqcyh-lkp@intel.com/Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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